Segment Information (Tables)

12 Months Ended

Jul. 31, 2015

Segment Reporting [Abstract]

Segment profitability allocation methodology

Segment information is presented in the table below:

	Fiscal Year Ended July 31, 2015
	Telecommunications Transmission			RF Microwave Amplifiers	Mobile Data Communications	Unallocated		Total
Net sales	$	189,971,000		92,118,000	25,200,000	—		$	307,289,000
Operating income (loss)	32,575,000			6,849,000	11,313,000	(16,660,000	)	34,077,000
Interest income and other (expense)	(74,000		)	—	12,000	467,000		405,000
Interest expense (income)	281,000			—	—	198,000		479,000
Depreciation and amortization	8,746,000			3,663,000	294,000	4,396,000		17,099,000
Expenditure for long-lived assets, including intangibles	1,935,000			920,000	441,000	66,000		3,362,000
Total assets at July 31, 2015	230,602,000			92,868,000	5,809,000	144,598,000		473,877,000

	Fiscal Year Ended July 31, 2014
	Telecommunications Transmission		RF Microwave Amplifiers	Mobile Data Communications		Unallocated		Total
Net sales	$	231,462,000	87,977,000	27,711,000		—		$	347,150,000
Operating income (loss)	40,779,000		4,533,000	13,131,000		(14,545,000	)	43,898,000
Interest income and other	2,000		21,000	12,000		878,000		913,000
Interest expense (income)	247,000		—	(3,000	)	6,060,000		6,304,000
Depreciation and amortization	8,891,000		3,784,000	270,000		4,324,000		17,269,000
Expenditure for long-lived assets, including intangibles	4,060,000		561,000	299,000		17,000		4,937,000
Total assets at July 31, 2014	230,555,000		87,454,000	5,929,000		149,914,000		473,852,000

	Fiscal Year Ended July 31, 2013
	Telecommunications Transmission			RF Microwave Amplifiers		Mobile Data Communications		Unallocated		Total
Net sales	$	194,643,000		86,939,000		38,215,000		—		$	319,797,000
Operating income (loss)	31,686,000			4,104,000		12,288,000		(13,589,000	)	34,489,000
Interest income and other (expense)	(38,000		)	(42,000	)	18,000		1,229,000		1,167,000
Interest expense	352,000			—		(7,000	)	7,818,000		8,163,000
Depreciation and amortization	9,591,000			3,939,000		500,000		3,265,000		17,295,000
Expenditure for long-lived assets, including intangibles	4,179,000			842,000		317,000		9,000		5,347,000
Total assets at July 31, 2013	225,626,000			96,298,000		7,873,000		352,018,000		681,815,000