Condensed Statements of Cash Flows - USD ($)	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Operating activities
Royalties received	$ 366,840	$ 1,172,787
Interest received	3,545	1,574
Expenses paid	(301,911)	(470,953)
Net cash from operating activities	68,474	703,408
Investing activities
Maturities of U.S. Government securities	82,628	5,585,240
Financing activity
Distributions to unitholders	(1,836,801)	(656,001)
Net change in cash and cash equivalents	(1,685,699)	5,632,647
Cash and cash equivalents, beginning of year	13,695,168	2,587,165
Cash and cash equivalents, end of period	12,009,469	8,219,812
Reconciliation of net income to net cash from operating activities
Net income	3,361,707	(430,252)
Decrease (increase) in accrued income receivable	(1,186,953)	976,851
Decrease (increase) in prepaid expense	(11,369)	(5,493)
Increase (decrease) in accrued expenses	4,504	(94,762)
Increase in deferred royalty revenue	(2,099,415)	257,064
Net cash from operating activities	68,474	703,408
Non cash financing activity
Distributions declared and payable	$ 7,216,006	$ 2,624,002