Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue:
Wireless	$ 27,859	$ 30,222	$ 56,031	$ 60,912
Software	16,776	17,747	33,992	35,195
Total revenue	44,635	47,969	90,023	96,107
Operating expenses:
Cost of revenue	7,513	9,131	15,528	17,944
Service, rental and maintenance	11,399	11,003	22,612	22,260
Selling and marketing	6,429	6,790	12,957	13,838
General and administrative	10,439	10,472	20,949	21,473
Severance	0	1,504	(3)	1,504
Depreciation, amortization and accretion	3,235	3,448	6,558	7,195
Total operating expenses	39,015	42,348	78,601	84,214
Operating income	5,620	5,621	11,422	11,893
Interest income	61	3	109	2
Other income	104	264	357	325
Income before income tax expense	5,785	5,888	11,888	12,220
Income tax expense	(2,334)	(2,512)	(4,993)	(4,927)
Net income	$ 3,451	$ 3,376	$ 6,895	$ 7,293
Basic net income per common share (usd per share)	$ 0.17	$ 0.16	$ 0.33	$ 0.33
Diluted net income per common share (usd per share)	$ 0.17	$ 0.16	$ 0.33	$ 0.33
Basic weighted average common shares outstanding (shares)	20,544,327	21,677,299	20,614,023	21,787,434
Diluted weighted average common shares outstanding (shares)	20,705,206	21,735,829	20,831,740	21,843,591
Cash dividends declared per common share (usd per share)	$ 0.125	$ 0.125	$ 0.25	$ 0.250