Statements of Cash Flows - USD ($)	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Operating activities
Royalties received	$ 3,149,582	$ 2,997,561
Interest received	40,324	16,755
Expenses paid	(817,592)	(299,716)
Net cash from operating activities	2,372,314	2,714,600
Investing activities
Maturities of U.S. Government securities	18,236,603	15,853,108
Purchases of U.S. Government securities	(2,803,492)	(371,452)
Net cash used for investing activities	15,433,111	15,481,656
Financing activity
Distributions to unitholders	(18,236,814)	(15,481,612)
Net change in cash and cash equivalents	(431,389)	2,714,644
Cash and cash equivalents, beginning of period	881,810	314,835
Cash and cash equivalents, end of period	450,421	3,029,479
Reconciliation of net income to net cash from operating activities
Net income	4,910,288	6,315,848
Increase in accrued income receivable	(1,038,520)	(2,338,568)
Increase in contract asset	(1,238,447)	(1,331,163)
Increase in prepaid expense	(16,613)	(14,511)
Increase (decrease) in accrued expenses	(244,394)	82,994
Net cash from operating activities	2,372,314	2,714,600
Non cash financing activity
Distributions declared and payable	$ 11,676,809	$ 5,904,005