Condensed Consolidated Statements Of Changes In Stockholders' Equity - USD ($)	Preferred Stock [Member]	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Total
Balance at Apr. 30, 2021		$ 42,560	$ 23,751,461	$ 36,755,040	$ 60,549,061
Recognition of stock-based compensation			20,035		20,035
Restricted stock awards		15	13,342		13,357
Net income				8,796,716	8,796,716
Balance at Jul. 31, 2021		42,575	23,784,838	45,551,756	69,379,169
Balance at Apr. 30, 2022		60,379	41,654,410	46,619,208	88,333,997
Recognition of stock-based compensation			94,893		94,893
Restricted stock awards		55	49,818		49,873
Net income				1,376,675	1,376,675
Balance at Jul. 31, 2022		$ 60,434	$ 41,799,121	$ 47,995,883	$ 89,855,438