NOTE 5. MARKETABLE SECURITIES: Fair values of our marketable securities aggregated by credit rating (Details) - USD ($)	Dec. 31, 2024	Mar. 31, 2024
Marketable Securities	$ 49,720,837	$ 52,548,876
Standard & Poor's, AAA Rating
Marketable Securities	9,795,999
Standard & Poor's, AA+ Rating
Marketable Securities	3,877,878
Standard & Poor's, AA Rating
Marketable Securities	9,755,138
Standard & Poor's, AA- Rating
Marketable Securities	18,408,078
Standard & Poor's, A+ Rating
Marketable Securities	2,915,398
Standard & Poor's, A Rating
Marketable Securities	$ 4,968,346