Statements of Stockholders' Equity - USD ($)	Preferred Stock [Member]	Common Stock Class A [Member]	Additional Paid-in Capital [Member]	Treasury Stock Common ClassA (Member)	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance at Apr. 30, 2022	$ 99,000	$ 850,000	$ 1,934,000	$ (4,547,000)	$ (137,000)	$ 50,843,000	$ 49,042,000
Balance, shares at Apr. 30, 2022	4,100	8,502,881		3,571,693
Prior period adjustment for provisions related to depreciation						(161,000)	(161,000)
Purchases of common stock				$ (7,000)			(7,000)
Purchases of common stock, shares				645
Dividend declared per common share outstanding						(2,958,000)	(2,958,000)
Unrealized gain (loss), net of tax effect					(24,000)		(24,000)
Net Income						4,757,000	4,757,000
Balance, shares at Apr. 30, 2023	4,100	8,502,881		3,572,338
Balance at Apr. 30, 2023	$ 99,000	$ 850,000	1,934,000	$ (4,554,000)	(161,000)	52,481,000	50,649,000
Purchases of common stock				$ (391,000)			(391,000)
Purchases of common stock, shares				33,813
Dividend declared per common share outstanding						(3,203,000)	(3,203,000)
Unrealized gain (loss), net of tax effect					24,000		24,000
Net Income						7,558,000	7,558,000
Balance, shares at Apr. 30, 2024	4,100	8,502,881		3,606,151
Balance at Apr. 30, 2024	$ 99,000	$ 850,000	$ 1,934,000	$ (4,945,000)	$ (137,000)	$ 56,836,000	$ 54,637,000