NOTE 5. MARKETABLE SECURITIES: Fair values of our marketable securities aggregated by credit rating (Details) - USD ($)	Sep. 30, 2024	Mar. 31, 2024
Marketable Securities	$ 50,771,653	$ 52,548,876
Standard & Poor's, AAA Rating
Marketable Securities	2,653,557
Standard & Poor's, AA+ Rating
Marketable Securities	3,903,078
Standard & Poor's, AA Rating
Marketable Securities	9,735,137
Standard & Poor's, AA- Rating
Marketable Securities	21,573,351
Standard & Poor's, A+ Rating
Marketable Securities	2,990,546
Standard & Poor's, A Rating
Marketable Securities	$ 9,915,984