Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue:
Wireless revenue	$ 29,375	$ 32,855	$ 90,287	$ 100,724
Software revenue	16,806	16,936	52,002	48,280
Total revenue	46,181	49,791	142,289	149,004
Operating expenses:
Cost of revenue	7,871	8,000	25,816	21,985
Service, rental and maintenance	11,117	10,988	33,376	34,200
Selling and marketing	6,572	7,072	20,409	22,098
General and administrative	10,410	10,866	31,883	33,991
Severance and restructuring	141	545	1,645	569
Depreciation, amortization and accretion	3,413	4,247	10,608	12,628
Total operating expenses	39,524	41,718	123,737	125,471
Operating income	6,657	8,073	18,552	23,533
Interest income (expense), net	1	(63)	3	(194)
Other income (expense), net	784	(2)	1,110	(180)
Income before income tax expense	7,442	8,008	19,665	23,159
Income tax expense	(3,222)	(3,356)	(8,150)	(9,326)
Net income	$ 4,220	$ 4,652	$ 11,515	$ 13,833
Basic net income per common share (usd per share)	$ 0.20	$ 0.21	$ 0.53	$ 0.64
Diluted net income per common share (usd per share)	$ 0.20	$ 0.21	$ 0.53	$ 0.63
Basic weighted average common shares outstanding (shares)	21,301,311	21,651,347	21,623,612	21,643,951
Diluted weighted average common shares outstanding (shares)	21,352,838	22,135,554	21,687,526	22,089,892
Cash dividends declared per common share (usd per share)	$ 0.125	$ 0.125	$ 0.375	$ 0.375