NOTE 5. MARKETABLE SECURITIES: Fair values of our marketable securities aggregated by credit rating (Details) - USD ($)	Dec. 31, 2023	Mar. 31, 2023
Marketable Securities	$ 54,265,873	$ 52,544,283
Standard & Poor's, AAA Rating
Marketable Securities	5,559,340
Standard & Poor's, AA+ Rating
Marketable Securities	2,179,443
Standard & Poor's, AA Rating
Marketable Securities	6,745,419
Standard & Poor's, AA- Rating
Marketable Securities	21,194,039
Standard & Poor's, A+ Rating
Marketable Securities	2,954,497
Standard & Poor's, A Rating
Marketable Securities	9,650,572
Standard & Poor's, A- Rating
Marketable Securities	$ 5,982,563