Schedule of Financial Information Relating to Industry Segments (Details) - USD ($)	3 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Apr. 30, 2024
Segment Reporting Information [Line Items]
Total net revenue	$ 5,780,000	$ 4,728,000
Total income from operations	1,774,000	1,187,000
Total depreciation and amortization	125,000	117,000
Total capital expenditures	105,000	201,000
Total assets	64,763,000		$ 60,780,000
Security Alarm Products [Member]
Segment Reporting Information [Line Items]
Total net revenue	5,185,000	4,241,000
Total income from operations	1,591,000	1,065,000
Total depreciation and amortization	58,000	49,000
Total capital expenditures	100,000	201,000
Total assets	15,205,000		15,263,000
Cable and Wiring Tools [Member]
Segment Reporting Information [Line Items]
Total net revenue	372,000	328,000
Total income from operations	114,000	82,000
Total depreciation and amortization	30,000	30,000
Total capital expenditures
Total assets	1,989,000		2,082,000
Other Products [Member]
Segment Reporting Information [Line Items]
Total net revenue	223,000	159,000
Total income from operations	69,000	40,000
Total depreciation and amortization	24,000	24,000
Total capital expenditures	5,000
Total assets	973,000		859,000
Corporate General [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	13,000	14,000
Total capital expenditures
Total assets	$ 46,596,000		$ 42,576,000