Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Income Per Share of Common Stock
Net income	$ 1,607,000	$ 3,239,000	$ 6,528,000	$ 5,558,000
Basic EPS, Income	$ 1,607,000	$ 3,239,000	$ 6,528,000	$ 5,558,000
Basic EPS, Shares	4,895,382	4,899,692	4,896,281	4,918,746
Basic EPS, Per-Share Amount	$ 0.33	$ 0.66	$ 1.33	$ 1.13
Effect of dilutive Convertible Preferred Stock, Income
Effect of dilutive Convertible Preferred Stock, Shares	20,500	20,500	20,500	20,500
Effect of dilutive Convertible Preferred Stock, Per-Share Amount
Diluted EPS, Income	$ 1,607,000	$ 3,239,000	$ 6,528,000	$ 5,558,000
Diluted EPS, Shares	4,915,882	4,920,192	4,916,781	4,939,246
Diluted EPS, Per-Share Amount	$ 0.33	$ 0.66	$ 1.33	$ 1.13