Condensed Statements of Cash Flows - USD ($)	6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Cash flows from operating activities
Royalties received	$ 2,030,521	$ 3,839,431
Interest received	3,450	4,406
Expenses paid	(719,935)	(709,496)
Net cash provided by operating activities	1,314,036	3,134,341
Cash flows from investing activities
Maturities of U.S. Government Securities	5,690,347	82,320
Purchases of U.S. Government Securities		(82,628)
Net cash provided by (used for) investing activities	5,690,347	(308)
Cash flows used for financing activities
Distributions to Unitholders	(3,280,003)	(8,396,806)
Net change in cash and cash equivalents	3,724,380	(5,262,773)
Cash and cash equivalents, beginning of year	2,587,165	8,717,943
Cash and cash equivalents, end of period	6,311,545	3,455,170
Reconciliation of net income to net cash provided by operating activities
Net income	1,989,995	3,423,910
Increase in accrued income receivable	(516,111)	(209,533)
Increase in prepaid expenses	(79,607)	(79,358)
Decrease in accrued expenses	(80,241)	(678)
Net cash provided by operating activities	1,314,036	3,134,341
Non Cash Financing Activity
Distributions payable	$ 2,624,002	$ 524,800