NOTE 3. FAIR VALUE OF FINANCIAL INSTRUMENTS: Estimated fair value of assets that were accounted for at fair value on a recurring basis (Details) - USD ($)	Mar. 31, 2023	Mar. 31, 2022
Debt Securities, Available-for-Sale	$ 52,544,283	$ 51,910,887
Money Market Funds
Debt Securities, Available-for-Sale	906,141	6,756,993
Corporate Bond Securities
Debt Securities, Available-for-Sale	51,638,142	45,153,894
Fair Value, Inputs, Level 1
Debt Securities, Available-for-Sale	906,141	6,756,993
Fair Value, Inputs, Level 1 | Money Market Funds
Debt Securities, Available-for-Sale	906,141	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	51,638,142	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	$ 51,638,142	$ 45,153,894