Condensed Statements of Cash Flows - USD ($)	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Cash flows from operating activities
Royalties received	$ 1,172,787	$ 853,153
Interest received	1,574	19
Expenses paid	(470,953)	(371,199)
Net cash provided by operating activities	703,408	481,973
Cash flows from investing activities
Maturities of U.S. Government Securities	5,585,240	82,320
Purchases of U.S. Government Securities		(82,628)
Net cash provided by (used for) investing activities	5,585,240	(308)
Cash flows used for financing activities
Distributions to Unitholders	(656,001)	(8,396,806)
Net change in cash and cash equivalents	5,632,647	(7,915,141)
Cash and cash equivalents, beginning of year	2,587,165	8,717,943
Cash and cash equivalents, end of year	8,219,812	802,802
Reconciliation of net income to net cash provided by operating activities
Net income (loss)	(430,252)	940,266
Decrease (increase) in accrued income receivable	976,851	(464,838)
Increase in prepaid expense	(5,493)	(917)
Increase (decrease) in accrued expenses	(94,762)	7,462
Increase in deferred royalty revenue	257,064
Net cash provided by operating activities	$ 703,408	$ 481,973