STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($)	Common Stock	Additional Paid-in Capital	AOCI Including Portion Attributable to Noncontrolling Interest	Retained Earnings	Total
Equity Balance, Starting at Mar. 31, 2022	$ 48,308	$ 19,256,485	$ (318,120)	$ 45,578,456	$ 64,565,129
Shares Outstanding, Starting at Mar. 31, 2022	4,830,826
Unrealized loss from marketable securities, net of tax			(338,553)		(338,553)
Net income				4,140,116	4,140,116
Total comprehensive income					3,801,563
Shares Granted, Value, Share-Based Payment Arrangement, after Forfeiture		7,134			7,134
Cash dividends declared ($1.00 per share of common stock)				(4,830,826)	(4,830,826)
Shares Outstanding, Ending at Jun. 30, 2022	4,830,826
Equity Balance, Ending at Jun. 30, 2022	$ 48,308	19,263,619	(656,673)	44,887,746	63,543,000
Equity Balance, Starting at Mar. 31, 2023	$ 48,308	19,295,442	(1,213,858)	48,949,610	67,079,502
Shares Outstanding, Starting at Mar. 31, 2023	4,830,826
Stock Issued During Period, Value, Stock Options Exercised	$ 26	117,501			117,527
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period	2,575
Unrealized loss from marketable securities, net of tax			(234,701)		(234,701)
Net income				4,403,730	4,403,730
Total comprehensive income					4,169,029
Shares Granted, Value, Share-Based Payment Arrangement, after Forfeiture		10,536			10,536
Cash dividends declared ($1.00 per share of common stock)				(4,830,826)	(4,830,826)
Shares Outstanding, Ending at Jun. 30, 2023	4,833,401
Equity Balance, Ending at Jun. 30, 2023	$ 48,334	$ 19,423,479	$ (1,448,559)	$ 48,522,514	$ 66,545,768