Summary of Significant Accounting and Reporting Policies (Tables)

12 Months Ended

Jul. 31, 2013

Accounting Policies [Abstract]

Schedule of combined MTS and BFT-1 sales

	Net Sales		Percentage of Mobile Data Communications Segment Net Sales		Percentage of Consolidated Net Sales
2013	$	29,061,000	76.0	%	9.1	%
2012	87,769,000		78.0	%	20.6	%
2011	248,578,000		86.2	%	40.6	%

Schedule of numerators and denominators used in basic and diluted EPS calculations

	Fiscal Years Ended July 31,
	2013		2012	2011
Numerator:
Net income for basic calculation	$	17,808,000	32,416,000	67,895,000
Effect of dilutive securities:
Interest expense (net of tax) on 3.0% convertible senior notes	4,468,000		4,468,000	4,468,000
Numerator for diluted calculation	$	22,276,000	36,884,000	72,363,000
Denominator:
Denominator for basic calculation	16,963,000		19,995,000	26,842,000
Effect of dilutive securities:
Stock-based awards	91,000		228,000	215,000
Conversion of 3.0% convertible senior notes	6,010,000		5,768,000	5,566,000
Denominator for diluted calculation	23,064,000		25,991,000	32,623,000