Condensed Statements of Cash Flows - USD ($)	6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Operating activities
Royalties received	$ 5,321,510	$ 15,857,438
Interest received	295,745	25,666
Expenses paid	(1,832,846)	(1,216,251)
Net cash from operating activities	3,784,409	14,666,853
Investing activities
Maturities of U.S. Government securities	53,995,684	49,166,956
Purchases of U.S. Government securities	(53,995,684)	(72,503,643)
Net cash from (used for) investing activities		(23,336,687)
Financing activity
Distributions to unitholders		(36,604,828)
Net change in cash and cash equivalents	3,784,409	(45,274,662)
Cash and cash equivalents, beginning of period	13,966,500	47,727,522
Cash and cash equivalents, end of period	17,750,909	2,452,860
Reconciliation of net income to net cash from operating activities
Net income	10,206,479	8,737,814
(Increase) decrease in accrued income receivable	(1,789,038)	4,622,034
(Increase) decrease in contract asset	(2,033,676)	1,431,633
Increase in prepaid expense	(176,709)	(176,940)
(Decrease) increase in accrued expenses	(124,526)	52,312
Decrease in contract liability	(2,298,121)
Net cash from operating activities	$ 3,784,409	14,666,853
Non cash financing activity
Distributions declared and payable		$ 11,020,810