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Condensed Statements of Income (USD $)
3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Revenues    
Royalty income $ 1,315,953us-gaap_RoyaltyRevenue $ 501,300us-gaap_RoyaltyRevenue
Interest income 2,057us-gaap_InvestmentIncomeInterest 2,135us-gaap_InvestmentIncomeInterest
Total revenues 1,318,010us-gaap_Revenues 503,435us-gaap_Revenues
Expenses 377,744us-gaap_GeneralAndAdministrativeExpense 366,217us-gaap_GeneralAndAdministrativeExpense
Net income $ 940,266us-gaap_NetIncomeLoss $ 137,218us-gaap_NetIncomeLoss
Number of units outstanding 13,120,010msb_WeightedAverageNumberOfUnitsOutstanding 13,120,010msb_WeightedAverageNumberOfUnitsOutstanding
Net income per unit (Note 2) $ 0.0717us-gaap_EarningsPerShareBasic $ 0.0105us-gaap_EarningsPerShareBasic