NOTE 5. FAIR VALUE OF FINANCIAL INSTRUMENTS: Estimated fair value of assets that were accounted for at fair value on a recurring basis (Details) - USD ($)	Dec. 31, 2022	Mar. 31, 2022
Debt Securities, Available-for-Sale	$ 52,020,382	$ 51,910,887
Money Market Funds
Debt Securities, Available-for-Sale	515,519	6,756,993
Corporate Bond Securities
Debt Securities, Available-for-Sale	51,504,863	45,153,894
Fair Value, Inputs, Level 1
Debt Securities, Available-for-Sale	515,519	6,756,993
Fair Value, Inputs, Level 1 | Money Market Funds
Debt Securities, Available-for-Sale	515,519	6,756,993
Fair Value, Inputs, Level 1 | Corporate Bond Securities
Debt Securities, Available-for-Sale	0	0
Fair Value, Inputs, Level 2
Debt Securities, Available-for-Sale	51,504,863	45,153,894
Fair Value, Inputs, Level 2 | Money Market Funds
Debt Securities, Available-for-Sale	0	0
Fair Value, Inputs, Level 2 | Corporate Bond Securities
Debt Securities, Available-for-Sale	$ 51,504,863	$ 45,153,894