Business Segments (Tables)

12 Months Ended

Apr. 30, 2017

Segment Reporting [Abstract]

Schedule of Financial Information Relating to Industry Segments

The following is financial information relating to industry segments:

	Quarter ended		Year ended		Year ended
	April 30, 2017		April 30, 2017		April 30, 2016
Net revenue:
Security alarm products	$	2,232,000	$	6,968,000	$	8,989,000
Other products		478,000		3,936,000		2,251,000
Total net revenue	$	2,710,000	$	10,904,000	$	11,240,000
Income from operations:
Security alarm products		420,000		1,778,000		2,689,000
Other products		237,000		1,005,000		673,000
Total income from operations	$	657,000	$	2,783,000	$	3,362,000
Depreciation and amortization:
Security alarm products		9,000		38,000		16,000
Other products		28,000		108,000		123,000
Corporate general		12,000		41,000		43,000
Total depreciation and amortization	$	49,000	$	187,000	$	182,000
Capital expenditures:
Security alarm products		14,000		14,000		24,000
Other products		10,000		140,000		33,000
Corporate general		—		16,000		219,000
Total capital expenditures	$	24,000	$	170,000	$	276,000

	April 30, 2017		April 30, 2016
Identifiable assets:
Security alarm products		3,180,000		4,203,000
Other products		1,517,000		1,142,000
Corporate general		33,767,000		31,323,000
Total assets	$	38,464,000	$	36,668,000