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Condensed Statements of Cash Flows (USD $)
 9 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Cash flows from operating activities    
Royalties received $ 16,895,966 $ 14,519,624
Interest received 4,618 1,156
Expenses paid (1,096,536) (772,259)
Net cash provided by operating activities 15,804,048 13,748,521
Cash flows from investing activities    
Maturities of U.S. Government Securities 105,000 240,000
Sale of U.S. Government Securities 100,056 100,012
Purchases of U.S. Government Securities (205,447) (82,380)
Net cash provided by (used for) investing activities (391) 257,632
Cash flows used for financing activities    
Distributions to Unitholders (11,676,809) (13,513,611)
Net change in cash and cash equivalents 4,126,848 492,542
Cash and cash equivalents, beginning of year 7,719,963 6,727,461
Cash and cash equivalents, end of period 11,846,811 7,220,003
Reconciliation of net income to net cash provided by operating activities    
Net income 19,093,365 15,963,684
Decrease (increase) in accrued income receivable (3,245,968) (2,190,369)
Decrease (increase) in prepaid expense (37,417) (35,783)
Increase (decrease) in accrued expenses (5,932) 10,989
Net cash provided by operating activities 15,804,048 13,748,521
Non Cash Financing Activity    
Distributions payable $ 11,545,608 $ 6,691,205