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BALANCE SHEETS (USD $)
Jan. 31, 2015
Jan. 31, 2014
ASSETS    
CASH AND CASH EQUIVALENTS $ 8,717,943us-gaap_CashAndCashEquivalentsAtCarryingValue $ 7,719,963us-gaap_CashAndCashEquivalentsAtCarryingValue
U.S. GOVERNMENT SECURITIES, at amortized cost (which approximates market) 510,573us-gaap_USGovernmentSecuritiesAtCarryingValue 205,055us-gaap_USGovernmentSecuritiesAtCarryingValue
ACCRUED INCOME RECEIVABLE 558,385msb_AccruedIncomeReceivable 63,253msb_AccruedIncomeReceivable
PREPAID EXPENSE 54,957us-gaap_PrepaidExpenseCurrent 54,950us-gaap_PrepaidExpenseCurrent
CURRENT ASSETS 9,841,858us-gaap_AssetsCurrent 8,043,221us-gaap_AssetsCurrent
U.S. GOVERNMENT SECURITIES, at amortized cost (which approximates market) 255,759msb_USGovernmentSecuritiesAtCarryingValueNoncurrent 510,573msb_USGovernmentSecuritiesAtCarryingValueNoncurrent
Assignments of leased property    
Amended assignment of Peters Lease 1msb_AmendedAssignmentsOfLeaseProperty 1msb_AmendedAssignmentsOfLeaseProperty
Assignment of Cloquet Leases 1msb_AssignmentsOfLeasedProperty 1msb_AssignmentsOfLeasedProperty
Certificate of beneficial interest for 13,120,010 units of Land Trust 1msb_CertificateOfBeneficialInterestLandTrust 1msb_CertificateOfBeneficialInterestLandTrust
TOTAL FIXED PROPERTY, including intangibles, at nominal values 3msb_FixedPropertyIncludingIntangible 3msb_FixedPropertyIncludingIntangible
TOTAL ASSETS 10,097,620us-gaap_Assets 8,553,797us-gaap_Assets
LIABILITIES, UNALLOCATED RESERVE AND TRUST CORPUS    
DISTRIBUTION PAYABLE 8,396,806us-gaap_InterestAndDividendsPayableCurrent 7,478,406us-gaap_InterestAndDividendsPayableCurrent
ACCRUED EXPENSES 89,687us-gaap_AccruedLiabilitiesCurrentAndNoncurrent 91,294us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
TOTAL LIABILITIES 8,486,493us-gaap_Liabilities 7,569,700us-gaap_Liabilities
UNALLOCATED RESERVE 1,611,124msb_UnallocatedReserve 984,094msb_UnallocatedReserve
TRUST CORPUS 3us-gaap_CapitalUnits 3us-gaap_CapitalUnits
TOTAL LIABILITIES, UNALLOCATED RESERVE AND TRUST CORPUS $ 10,097,620us-gaap_LiabilitiesAndStockholdersEquity $ 8,553,797us-gaap_LiabilitiesAndStockholdersEquity