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Condensed Balance Sheets (USD $)
Apr. 30, 2015
Jan. 31, 2015
Assets    
Cash and cash equivalents $ 802,802us-gaap_CashAndCashEquivalentsAtCarryingValue $ 8,717,943us-gaap_CashAndCashEquivalentsAtCarryingValue
U.S. Government securities, at amortized cost (which approximates market) 528,593us-gaap_USGovernmentSecuritiesAtCarryingValue 510,573us-gaap_USGovernmentSecuritiesAtCarryingValue
Accrued income receivable 1,023,223msb_AccruedIncomeReceivable 558,385msb_AccruedIncomeReceivable
Prepaid expenses 55,874us-gaap_PrepaidExpenseCurrent 54,957us-gaap_PrepaidExpenseCurrent
Current assets 2,410,492us-gaap_AssetsCurrent 9,841,858us-gaap_AssetsCurrent
U.S. Government securities, at amortized cost (which approximates market) 238,047msb_USGovernmentSecuritiesAtCarryingValueNoncurrent 255,759msb_USGovernmentSecuritiesAtCarryingValueNoncurrent
Fixed property, including intangibles, at nominal values    
Amended Assignment of Peters Lease 1msb_AmendedAssignmentsOfLeaseProperty 1msb_AmendedAssignmentsOfLeaseProperty
Assignment of Cloquet Lease 1msb_AssignmentsOfLeasedProperty 1msb_AssignmentsOfLeasedProperty
Certificate of beneficial interest for 13,120,010 units of land trust 1msb_CertificateOfBeneficialInterestLandTrust 1msb_CertificateOfBeneficialInterestLandTrust
Total other assets 3msb_FixedPropertyIncludingIntangible 3msb_FixedPropertyIncludingIntangible
Total assets 2,648,542us-gaap_Assets 10,097,620us-gaap_Assets
Liabilities    
Distribution payable   8,396,806us-gaap_InterestAndDividendsPayableCurrent
Accrued expenses 97,149us-gaap_AccruedLiabilitiesCurrentAndNoncurrent 89,687us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
Total liabilities 97,149us-gaap_Liabilities 8,486,493us-gaap_Liabilities
Unallocated Reserve (Note 4) 2,551,390msb_UnallocatedReserve 1,611,124msb_UnallocatedReserve
Trust Corpus 3us-gaap_CapitalUnits 3us-gaap_CapitalUnits
Total liabilities, unallocated reserve and trust corpus $ 2,648,542us-gaap_LiabilitiesAndStockholdersEquity $ 10,097,620us-gaap_LiabilitiesAndStockholdersEquity