Condensed Statements of Cash Flows - USD ($)	6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Cash flows from operating activities
Royalties received	$ 3,839,431	$ 5,051,370
Interest received	4,406	4,277
Expenses paid	(709,496)	(929,022)
Net cash provided by operating activities	3,134,341	4,126,625
Cash flows from investing activities
Maturities of U.S. Government Securities	82,320	105,000
Sale of U.S. Government Securities		100,056
Purchases of U.S. Government Securities	(82,628)	(205,447)
Net cash used for investing activities	(308)	(391)
Cash flows used for financing activities
Distributions to unitholders	(8,396,806)	(7,478,406)
Net change in cash and cash equivalents	(5,262,773)	(3,352,172)
Cash and cash equivalents, beginning of year	8,717,943	7,719,963
Cash and cash equivalents, end of period	3,455,170	4,367,791
Reconciliation of net income to net cash provided by operating activities
Net income	3,423,910	7,553,759
Increase in accrued income receivable	(209,533)	(3,308,148)
Increase in prepaid expense	(79,358)	(88,808)
Decrease in accrued expenses	(678)	(30,178)
Net cash provided by operating activities	3,134,341	4,126,625
Non Cash Financing Activity
Distributions payable	$ 524,800	$ 4,198,403