Segments - Segment Reporting Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Revenue	$ 20,586	$ 20,671
Income (loss) from operations	(120)	237
Total assets	13,115	13,606
Allowance for doubtful accounts	285	555
Depreciation and amortization	134	105
Income tax expense	20	20
Communications Systems and Services [Member]
Revenue		1,826
Income (loss) from operations		(465)
Total assets		2,178
Capital expenditures		0
Allowance for doubtful accounts		342
Depreciation and amortization		6
Income tax expense		0
Telephony Products [Member]
Revenue	11,129	12,807
Income (loss) from operations	(440)	1,057
Total assets	8,768	7,616
Capital expenditures	129	100
Allowance for doubtful accounts	123	16
Depreciation and amortization	49	37
Income tax expense	20	20
Puerto Rico [Member]
Revenue	9,457	7,864
Income (loss) from operations	320	100
Total assets	4,347	3,812
Capital expenditures	159	132
Allowance for doubtful accounts	162	197
Depreciation and amortization	85	62
Income tax expense	0	0
Total [Member]
Revenue	20,586	22,497
Income (loss) from operations	(120)	692
Total assets	13,115	13,606
Capital expenditures	288	232
Allowance for doubtful accounts	285	555
Depreciation and amortization	134	105
Income tax expense	$ 20	$ 20