Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue:
Wireless	$ 27,024	$ 29,375	$ 83,055	$ 90,287
Software	18,331	16,806	52,322	52,002
Total revenue	45,355	46,181	135,377	142,289
Operating expenses:
Cost of revenue	7,639	7,871	23,167	25,816
Service, rental and maintenance	11,898	11,117	34,510	33,376
Selling and marketing	5,955	6,572	18,912	20,409
General and administrative	10,593	10,410	31,542	31,883
Severance	12	141	9	1,645
Depreciation, amortization and accretion	3,229	3,413	9,787	10,608
Total operating expenses	39,326	39,524	117,927	123,737
Operating income	6,029	6,657	17,450	18,552
Interest income	67	1	176	3
Other income	85	784	443	1,110
Income before income tax expense	6,181	7,442	18,069	19,665
Income tax expense	(2,123)	(3,222)	(7,116)	(8,150)
Net income	$ 4,058	$ 4,220	$ 10,953	$ 11,515
Basic net income per common share (usd per share)	$ 0.20	$ 0.20	$ 0.53	$ 0.53
Diluted net income per common share (usd per share)	$ 0.20	$ 0.20	$ 0.53	$ 0.53
Basic weighted average common shares outstanding (shares)	20,517,419	21,301,311	20,581,586	21,623,612
Diluted weighted average common shares outstanding (shares)	20,532,345	21,315,685	20,596,050	21,638,973
Cash dividends declared per common share (usd per share)	$ 0.125	$ 0.125	$ 0.375	$ 0.375