Document and Entity Information
Royalties under amended lease agreements
Royalties under Amended Lease Agreements
Revenue earned during the period from the leasing or otherwise lending to a third party the entity's rights or title to property under amended lease agreements. Royalty income under the amended lease agreements is recognized as it is earned.
Royalties under Peters Lease fee
Royalties under Peters Lease Fee
Revenue earned during the period from the leasing or otherwise lending to a third party the entity's rights or title to property under Peters Lease fee. Royalty income under the Peters Lease fee agreement also is recognized quarterly as it is earned. Under such agreement, however, royalties are earned at the option of lessee either upon mining of crude ore from Peters Lease lands or upon shipment from Silver Bay of iron ore product produced from Peters Lease lands.
Number of units outstanding
Weighted Average Number of Units Outstanding
Average number of units of beneficial interests outstanding during the reporting period.
Distributions declared per unit (in dollars per unit)
Cash dividends declared per unit by an entity during the period for all units of stock and subsequently paid within the following period.
Distribution, Declared, Per Unit
The aggregate amount of individual trustees and corporate trustee annual compensation for services as trustee.
Compensation of Trustees
Compensation of Trustees
Professional fees and expenses:
Professional Fees and Expenses [Abstract]
Accounting
Accounting Expense
The amount of expense reported in the period for accounting services incurred on or before the balance sheet date pertaining to auditing and non-auditing services.
The amount of expense provided in the period for consulting and field representative fees incurred on or before the balance sheet date pertaining to services, advice and reports with respect to monthly production and shipments, and discussions concerning the condition and accuracy of the scales used to weigh iron ore pellets produced.
Mining consultant and field representatives
Mining Consultant and Field Representatives Expense
Directors and Officers Liability Insurance Expense
The expense in the period incurred with respect to professional liability coverage for legal expenses and liability to unitholders, bondholders, creditors or others due to actions or omissions by a director or officer of a corporation or nonprofit organization.
Insurance
Amendment Description
Annual stock exchange fee
Annual Stock Exchange Fee
The aggregate amount of expense related to the fees associated with the stock listing on the New York Stock Exchange.
Amendment Flag
Transfer agent's and registrar's fees
Transfer Agent and Registrar Fees
This element represent Transfer agent's fees related to maintaining records of investors and account balances and transactions, cancelling and issuing certificates, processing investor mailings and dealing with any associated problems. It also include registrar's fees.
ACCRUED INCOME RECEIVABLE
Accrued Income Receivable
Royalty revenue and estimated price adjustments related to prior periods earned but not yet received by the entity on its mineral interests.
This element represents the noncurrent portion of investment in Debt (bills, notes or bonds) that are issued by the government of the United States which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
US Government Securities, at Carrying Value, Noncurrent
U.S. GOVERNMENT SECURITIES, at amortized cost (which approximates market)
Fixed Property Including Intangible [Abstract]
FIXED PROPERTY, including intangibles, at nominal values
Amended assignment of Peters Lease
Amended Assignments of Lease Property
The interest as assignor in the Amended Assignment of Peters Lease. The Peters Lease provides that each leasehold estate will continue until the reserves of iron ore, taconite and other minerals or materials on the land subject to the Peters Lease are exhausted.
Assignment of Cloquet Leases
Assignments of Leased Property
The interest as assignor in the Amended Assignment of Cloquet Lease, executed in 1916 between Cloquet Lumber Company and Claude W. Peters.
Carrying value as of the balance sheet date of the transferable units distributed to shareholders of Mesabi Iron Company as beneficial interest in Mesabi Trust.
Certificate of beneficial interest for 13,120,010 units of Land Trust
Certificate of Beneficial Interest Land Trust
TOTAL FIXED PROPERTY, including intangibles, at nominal values
Fixed Property Including Intangible
Sum of the carrying amounts as of the balance sheet date of all fixed and intangible assets that are recognized at nominal value.
Assignments of leased property
Assignments of Leased Property [Abstract]
UNALLOCATED RESERVE
Unallocated Reserve
1. Balance sheet - unallocated reserve definition - cell J21 - Should read "The cumulative amount of the reporting entity's undistributed earnings or deficit, consisting primarily of accrued income receivable representing royalties not yet received by the Trust but anticipated to be received in future periods.
Unallocated Reserve at the beginning of the period
Unallocated Reserve at the end of the period
Certificate of beneficial interest of land trust, units
Transferable units distributed to shareholders of the predecessor entity as a beneficial interest in the reporting entity.
Certificate of Beneficial Interest, Units
Beneficial interest in the Trust (in units)
Interest received
Interest Received, Government Securities
Total amount of cash received from interest on US Treasury and Other US Government Securities.
Distributions to unitholders
The cash outflow from the trust's distributions to the unitholders.
Payments of Distributions to Unitholders
Distributions Declared
This element represents non cash financing activity of distribution declared.
Distributions declared and payable
Distributions Declared
Distributions Paid and Declared
The aggregate amount of distributions paid and declared in the period.
DIVIDEND AND DISTRIBUTION
Current Fiscal Year End Date
Period after Each Calendar Quarter when Entity Fiscal Quarter Ends
Period after the close of each calendar quarter when the fiscal quarter ends
Represents the period after the close of each calendar quarter when the fiscal quarter of the entity ends.
Dividend and Distribution Disclosure [Text Block]
DIVIDEND AND DISTRIBUTION
The entire narrative disclosure of dividend and other distributions made as per the prevalent notification and is pad usually at the end of the reporting period.
UNALLOCATED RESERVE AND DISTRIBUTIONS
UNALLOCATED RESERVE AND DISTRIBUTIONS
This element may be used to describe the maintenance of unallocated reserve and determination of distributions.
Unallocated Reserve and Distributions [Text Block]
ROYALTY AGREEMENT
ROYALTY AGREEMENT
This text block provides information about revenue recognition and royalty rate structures.
Royalty Agreement [Text Block]
Distribution paid $.51, $.46, $.08, 1.13, $.64, $.065, $1.12 , $.60, $.05, per unit for November 20, 2013, August 20, 2013, May 20, 2013, November 20, 2012, August 20, 2012, May 20, 2012, November 20, 2011, August 20, 2011, May 20, 2011, respectively
Cash dividends paid by an entity during the period for all units of stock.
Distribution Paid
Distribution declared $.57, $.49, $.76 per unit for January 17, 2014, January 15, 2013, January 13, 2012 respectively and paid on February 20, 2014, 2013 and 2011, respectively
Cash dividends declared by an entity during the period for all units of stock and subsequently paid within the following period.
Distribution Declared
Unallocated Reserve Units [Member]
Unallocated Reserve Number of Units
This element represent unallocated reserve number of units member.
Unallocated Reserve [Member]
Unallocated Reserve
The cumulative amount of the reporting trust's undistributed earnings or deficit and accrued income receivable primarily representing royalties not yet received by the Trust but anticipated to be received in future periods.
Trust Corpus [Member]
Trust Corpus
This element represent trust Corpus amount member.
Document Period End Date
STATEMENTS OF UNALLOCATED RESERVE AND TRUST CORPUS
Distribution, Paid, Per Unit
Cash dividends paid per unit by an entity during the period for all units of stock.
Distribution paid (in dollars per unit)
Unallocated Reserve and Distributions [Table Text Block]
Schedule of unallocated cash and U.S. government securities portion of the Trust's Unallocated Reserve
Tabular disclosure of unallocated cash and U.S. Government securities portion of the Trust's Unallocated Reserve.
Unallocated Reserve and Distributions Reconciliation [Table Text Block]
Schedule of reconciliation of Trust's Unallocated Reserve
Tabular disclosure of reconciliation of the Trust's Unallocated Reserve.
Schedule of the Trust's Unallocated Reserve and distributions.
Unallocated Reserve and Distributions [Table]
Unallocated Reserve and Distributions [Line Items]
UNALLOCATED RESERVE AND DISTRIBUTIONS
Cash and Cash Equivalents and US Government Securities
Cash and U.S. Government Securities
Represents the amount of currency on hand as well as demand deposits with banks or financial institutions and U.S. Government securities.
Unallocated Cash and Cash Equivalents and US Government Securities
Unallocated Cash and U.S. Government Securities
Represents the maintained level of unallocated reserve in the form of cash and U.S. Government securities.
Unallocated Reserve and Distributions [Roll Forward]
Reconciliation of Unallocated Reserve
Entity [Domain]
Period of Termination after Death of Last Survivor
Period of termination of the Trust after the death of the survivor of persons named in the exhibit
Represents the termination period of the Trust after the death of the last survivor of the persons named in the exhibit as per the Agreement of Trust.
Number of Persons Named in Exhibit to Agreement of Trust
Number of persons named in the exhibit to the Agreement of Trust
Represents the number of persons named in the exhibit to the Agreement of Trust.
Age of the youngest survivor
Represents the believed age of the youngest surviving member named in the exhibit to the Agreement of Trust.
Trust Agreement Age of Youngest Survivor
Fixed Property Including Intangibles [Policy Text Block]
Fixed Property, Including Intangibles
Disclosure of accounting policy for fixed property, including intangibles.
Quantity of iron ore shipped by NMC subject to price determination recognized in revenue (in tons)
Represents the quantity of iron ore subject to price determination, expressed in tons.
Recognized Revenue Sold Quantity Subject to Price Determination
Fixed Property Including Intangibles [Abstract]
Fixed Property, Including Intangibles
Percentage of Fee Interest Held by Land Trust in Lease Property
Percentage of fee interest owned by Mesabi Land Trust in the lands subject to the Peters Lease
Represents the percentage of fee interest held by Mesabi Land Trust in the lands subject to the Peters Lease.
Collaborative Arrangement Obligation to Make Payments of Overriding Royalties on Shipment Products Period
Obligation to make payments of overriding royalties on product shipments, period
Represents the period within which the related party is obligated to make payments of overriding royalties on product shipments, following the calendar quarter in which such shipments occur, as per the collaborative agreement.
Collaborative Arrangement Adjusted Threshold Price Per Ton
Adjusted threshold price (in dollars per ton)
Represents the adjusted threshold price per ton as per the collaborative agreement.
Adjusted threshold price subject to adjustment (in dollars per ton)
Represents the adjusted threshold price per ton, subject to adjustment for inflation and deflation but not below a specified limit, as per the collaborative agreement.
Collaborative Arrangement Adjusted Threshold Price Per Ton Subject to Adjustment
Collaborative Arrangement Obligation Advance Royalty Subject to Adjustment
Obligation to pay advance royalty subject to adjustment
Represents the obligation to pay advance royalty, subject to adjustment for inflation and deflation.
Advance royalty
Represents the amount of annual advance royalty during the period.
Collaborative Arrangement Advance Royalty
Distribution Declared Distributions Paid
Distributed cash payments
Represents the cash distributions declared and paid by the entity during the period for all units of stock.
Distribution Declared Distributions Paid Per Unit
Distributed cash payments (in dollars per unit)
Represents the cash distributions per unit declared and paid by the entity during the period for all units of stock.
Distributions Declared Per Unit of Beneficial Interest
Distribution declared per unit of beneficial interest (in dollars per unit)
Represents the distribution declared per unit of beneficial interest.
Cyprus Northshore Minimg Corporation [Member]
Cyprus NMC
Represents information pertaining to Cyprus Northshore Mining Corporation.
Entity Well-known Seasoned Issuer
Entity Voluntary Filers
Entity Current Reporting Status
Entity Filer Category
Entity Public Float
Entity Registrant Name
Entity Central Index Key
Units of Beneficial Interest, Units Outstanding
Entity Common Stock, Shares Outstanding
Document Fiscal Year Focus
Document Fiscal Period Focus
Legal Entity [Axis]
Document Type
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
ACCRUED EXPENSES
Accrued Liabilities
TOTAL ASSETS
Assets
ASSETS
Assets [Abstract]
CURRENT ASSETS
Assets, Current
TRUST CORPUS
BALANCE
BALANCE
Capital Units, Value
CASH AND CASH EQUIVALENTS
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR
CASH AND CASH EQUIVALENTS, END OF YEAR
Cash and Cash Equivalents, at Carrying Value
Cash and Cash Equivalents
Cash and Cash Equivalents, Policy [Policy Text Block]
Cash and Cash Equivalents
Cash and Cash Equivalents [Abstract]
NON CASH FINANCING ACTIVITY
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
ROYALTY AGREEMENT
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Concentration of Credit Risk
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Debt Security [Axis]
Deferred royalty revenue (Note 4)
Deferred Revenue
NET INCOME PER UNIT
Earnings Per Share [Text Block]
Net Income Per Unit
Earnings Per Share, Policy [Policy Text Block]
NET INCOME PER UNIT (in dollars per unit)
Earnings Per Share, Basic
Net income per unit (in dollars per unit)
NET INCOME PER UNIT, Diluted (in dollars per unit)
Earnings Per Share, Diluted
NET INCOME PER UNIT
Equity Component [Domain]
Fair Value Measures
Fair Value Measurement, Policy [Policy Text Block]
Expenses
General and Administrative Expense
Fair Value
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due within one year
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value
Due after one year through three years
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value
Carrying Value
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Total
Held-to-maturity Securities
Due after one year through three years
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount
Due within one year
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount
Total
Held-to-maturity Securities, Fair Value
STATEMENTS OF INCOME
Increase in accrued income receivable
Decrease (increase) in accrued income receivable
Increase (Decrease) in Accrued Investment Income Receivable
Increase (decrease) in accrued expenses
Increase (Decrease) in Accrued Liabilities
Increase in deferred royalty revenue
Increase (Decrease) in Deferred Revenue
RECONCILIATION OF NET INCOME TO NET CASH FROM OPERATING ACTIVITIES
Increase (Decrease) in Operating Capital [Abstract]
Decrease (increase) in prepaid expense
Increase (Decrease) in Prepaid Expense
Increase (Decrease) in Unallocated Reserve and Trust Corpus
Increase (Decrease) in Stockholders' Equity [Roll Forward]
DISTRIBUTION PAYABLE
Distribution Payable
Interest and Dividends Payable, Current
Interest
Investment Income, Interest
Investments
Investment, Policy [Policy Text Block]
Schedule of U.S. government securities classified as held-to-maturity
Investments Classified by Contractual Maturity Date [Table Text Block]
U. S. GOVERNMENT SECURITIES
U. S. GOVERNMENT SECURITIES
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Legal
Legal Fees
TOTAL LIABILITIES, UNALLOCATED RESERVE AND TRUST CORPUS
Liabilities and Equity
Liabilities
Liabilities [Abstract]
TOTAL LIABILITIES
Liabilities
LIABILITIES, UNALLOCATED RESERVE AND TRUST CORPUS
Liabilities and Equity [Abstract]
Major Types of Debt Securities [Domain]
Within a range of not more
Maximum
Maximum [Member]
Within a range of not less
Minimum
Minimum [Member]
Amount held by the Trust in a money market fund
Money Market Funds, at Carrying Value
FINANCING ACTIVITY
Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract]
OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
NET CHANGE IN CASH AND CASH EQUIVALENTS
Net Cash Provided by (Used in) Continuing Operations
NET CASH FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities, Continuing Operations
NET CASH FROM (USED FOR) INVESTING ACTIVITIES
Net Cash Provided by (Used in) Investing Activities, Continuing Operations
INVESTING ACTIVITIES
Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]
NET INCOME
Net income
Net Income (Loss) Attributable to Parent
Net Income
Recent Accounting Pronouncements
New Accounting Pronouncements, Policy [Policy Text Block]
EXPENSES
Operating Expenses [Abstract]
Total expenses
Operating Expenses
NATURE OF BUSINESS AND ORGANIZATION
NATURE OF BUSINESS AND ORGANIZATION
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Other Trust expenses
Other Expenses
Expenses paid
Payments for Operating Activities
Purchases of U.S. Government securities
Payments to Acquire Held-to-maturity Securities
PREPAID EXPENSE
Prepaid Expense, Current
Reclassifications
Reclassification, Policy [Policy Text Block]
Royalties received
Proceeds from Royalties Received
Maturities of U.S. Government securities
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities
Sale of U.S. Government Securities
Proceeds from Sale of Held-to-maturity Securities
SUMMARY OF QUARTERLY EARNINGS (UNAUDITED)
Quarterly Financial Information [Text Block]
SUMMARY OF QUARTERLY EARNINGS (UNAUDITED)
Range [Axis]
Range [Domain]
Revenue Recognition
Revenue Recognition [Abstract]
Revenue Recognition
Revenue Recognition, Policy [Policy Text Block]
Total revenues
Revenue
Revenues
REVENUES
Revenues [Abstract]
Royalty income
Royalty Revenue
Summary of quarterly results of operations
Schedule of Quarterly Financial Information [Table Text Block]
Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table]
U. S. GOVERNMENT SECURITIES
Schedule of Held-to-maturity Securities [Line Items]
Schedule of Held-to-maturity Securities [Table]
BALANCE (in units)
BALANCE (in units)
Shares, Issued
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Significant Accounting Policies [Text Block]
Statement [Table]
Statement
Statement [Line Items]
STATEMENTS OF CASH FLOWS
Equity Components [Axis]
BALANCE SHEETS
Stock Issued During Period, Shares, Period Increase (Decrease)
Stockholders' Equity, Period Increase (Decrease)
SUBSEQUENT EVENT
Subsequent Events [Text Block]
SUBSEQUENT EVENT
Subsequent Events
Subsequent Events, Policy [Policy Text Block]
Corporate Trustee's administrative fees
Trustee Fees
Accounting Estimates
Use of Estimates, Policy [Policy Text Block]
U.S. government securities
US Government Debt Securities [Member]
U.S. GOVERNMENT SECURITIES, at amortized cost (which approximates market)
US Government Securities, at Carrying Value
WEIGHTED AVERAGE NUMBER OF UNITS OUTSTANDING
Weighted Average Number of Shares Outstanding, Diluted