Condensed Statements of Cash Flows - USD ($)	9 Months Ended
	Oct. 31, 2022	Oct. 31, 2021
Operating activities
Royalties received	$ 15,857,438	$ 44,366,652
Interest received	85,363	522,705
Expenses paid	(1,540,146)	(2,544,191)
Net cash from operating activities	14,402,655	42,345,166
Investing activities
Maturities of U.S. Government securities	84,858,549	50,942,392
Purchases of U.S. Government securities	(84,858,549)	(41,035,723)
Net cash from (used for) investing activities		9,906,669
Financing activity
Distributions to unitholders	(47,625,638)	(18,892,815)
Net change in cash and cash equivalents	(33,222,983)	33,359,020
Cash and cash equivalents, beginning of period	47,727,522	12,500,941
Cash and cash equivalents, end of period	14,504,539	45,859,961
Reconciliation of net income to net cash from operating activities
Net income	8,324,122	51,322,806
Decrease (increase) in accrued income receivable	4,597,050	(8,241,597)
Decrease (increase) in contract asset	1,431,633	(374,119)
Increase in prepaid expense	(87,773)	(107,937)
Increase (decrease) in accrued expenses	137,623	(253,987)
Net cash from operating activities	$ 14,402,655	42,345,166
Non cash financing activity
Distributions declared and payable		$ 18,630,414