Condensed Statements of Cash Flows - USD ($)	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Operating activities
Royalties received	$ 2,997,561	$ 366,840
Interest received	16,755	3,545
Expenses paid	(299,716)	(301,911)
Net cash from operating activities	2,714,600	68,474
Investing activities
Maturities of U.S. Government securities	15,853,108	82,628
Purchases of U.S. Government securities	(371,452)
Net cash from (used for) investing activities	15,481,656	82,628
Financing activity
Distributions to unitholders	(15,481,612)	(1,836,801)
Net change in cash and cash equivalents	2,714,644	(1,685,699)
Cash and cash equivalents, beginning of period	314,835	13,695,168
Cash and cash equivalents, end of period	3,029,479	12,009,469
Reconciliation of net income to net cash from operating activities
Net income	6,315,848	4,471,925
Increase in accrued income receivable	(2,338,568)	(1,186,953)
Increase in contract asset	(1,331,163)	(1,110,218)
Increase in prepaid expense	(14,511)	(11,369)
Increase in accrued expenses	82,994	4,504
Decrease in contract liability		(2,099,415)
Net cash from operating activities	2,714,600	68,474
Non cash financing activity
Distributions declared and payable	$ 5,904,005	$ 7,216,006