Condensed Statements of Cash Flows - USD ($)	6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Operating activities
Royalties received	$ 8,723,576	$ 2,030,521
Interest received	12,571	3,450
Expenses paid	(670,622)	(719,935)
Net cash from operating activities	8,065,525	1,314,036
Investing activities
Maturities of U.S. Government securities	82,628	5,690,347
Purchases of U.S. Government securities	(1,993,386)
Net cash (used for) from investing activities	(1,910,758)	5,690,347
Financing activity
Distributions to unitholders	(9,052,807)	(3,280,003)
Net change in cash and cash equivalents	(2,898,040)	3,724,380
Cash and cash equivalents, beginning of year	13,695,168	2,587,165
Cash and cash equivalents, end of period	10,797,128	6,311,545
Reconciliation of net income to net cash from operating activities
Net income	16,475,842	1,989,995
Decrease (increase) in accrued income receivable	(6,175,819)	(516,111)
Decrease (increase) in prepaid expense	(86,177)	(79,607)
Increase (decrease) in accrued expenses	(48,906)	(80,241)
Increase in deferred royalty revenue	(2,099,415)
Net cash from operating activities	8,065,525	1,314,036
Non cash financing activity
Distributions declared and payable	$ 2,099,202	$ 2,624,002