NOTE 5. MARKETABLE SECURITIES: Fair values of our marketable securities aggregated by credit rating (Details) - USD ($)	Jun. 30, 2024	Mar. 31, 2024
Marketable Securities	$ 52,951,591	$ 52,548,876
Standard & Poor's, AAA Rating
Marketable Securities	5,775,400
Standard & Poor's, AA+ Rating
Marketable Securities	3,798,418
Standard & Poor's, AA Rating
Marketable Securities	9,553,228
Standard & Poor's, AA- Rating
Marketable Securities	21,145,888
Standard & Poor's, A+ Rating
Marketable Securities	2,878,474
Standard & Poor's, A Rating
Marketable Securities	$ 9,800,183