NOTE 5. MARKETABLE SECURITIES: Fair values of our marketable securities aggregated by credit rating (Details) - USD ($)	Jun. 30, 2025	Mar. 31, 2025
Marketable Securities	$ 47,080,363	$ 47,901,258
Standard & Poor's, AAA Rating
Marketable Securities	7,504,403
Standard & Poor's, AA+ Rating
Marketable Securities	3,931,449
Standard & Poor's, AA Rating
Marketable Securities	4,869,192
Standard & Poor's, AA- Rating
Marketable Securities	17,686,530
Standard & Poor's, A+ Rating
Marketable Securities	$ 13,088,789