Schedule of Financial Information Relating to Industry Segments (Details) - USD ($)	3 Months Ended	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2024	Apr. 30, 2023
Segment Reporting Information [Line Items]
Total net revenue	$ 5,592,000	$ 21,767,000	$ 19,979,000
Total income from operations	1,615,000	6,289,000	5,060,000
Total depreciation and amortization	123,000	487,000	445,000
Total capital expenditures	115,000	378,000	548,000
Total assets	60,780,000	60,780,000	55,951,000
Security Alarm Products [Member]
Segment Reporting Information [Line Items]
Total net revenue	5,002,000	19,630,000	17,428,000
Total income from operations	1,457,000	5,672,000	4,414,000
Total depreciation and amortization	56,000	202,000	194,000
Total capital expenditures	97,000	321,000	237,000
Total assets	15,263,000	15,263,000	14,251,000
Cable and Wiring Tools [Member]
Segment Reporting Information [Line Items]
Total net revenue	368,000	1,484,000	1,870,000
Total income from operations	110,000	429,000	474,000
Total depreciation and amortization	30,000	121,000	122,000
Total capital expenditures
Total assets	2,082,000	2,082,000	2,548,000
Other Products [Member]
Segment Reporting Information [Line Items]
Total net revenue	222,000	653,000	681,000
Total income from operations	48,000	188,000	172,000
Total depreciation and amortization	24,000	92,000	81,000
Total capital expenditures		20,000	268,000
Total assets	859,000	859,000	981,000
Corporate General [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	13,000	72,000	48,000
Total capital expenditures	18,000	37,000	43,000
Total assets	$ 42,576,000	$ 42,576,000	$ 38,171,000