Condensed Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Wireless Revenue, net	$ 33,518	$ 37,771	$ 67,869	$ 76,550
Software Revenue, net	15,576	14,497	31,344	28,848
Revenues:
Total revenues	49,094	52,268	99,213	105,398
Operating expenses:
Cost of revenue	7,180	6,961	13,985	13,628
Service, rental and maintenance	11,420	12,018	23,212	24,209
Selling and marketing	7,780	6,538	15,026	12,932
General and administrative	10,990	11,022	23,125	23,353
Severance and restructuring	4	2	24	2
Depreciation, amortization and accretion	4,352	3,822	8,381	7,629
Total operating expenses	41,726	40,363	83,753	81,753
Operating income	7,368	11,905	15,460	23,645
Interest expense, net	(64)	(64)	(131)	(128)
Other (expense) income, net	(194)	(75)	(178)	6
Income before income tax expense	7,110	11,766	15,151	23,523
Income tax expense	(2,819)	(4,938)	(5,970)	(9,770)
Net income	$ 4,291	$ 6,828	$ 9,181	$ 13,753
Basic net income per common share	$ 0.20	$ 0.32	$ 0.42	$ 0.63
Diluted net income per common share	$ 0.19	$ 0.31	$ 0.42	$ 0.63
Basic weighted average common shares outstanding	21,642,163	21,644,281	21,640,191	21,666,096
Diluted weighted average common shares outstanding	22,099,791	21,827,149	22,073,254	21,921,742
Cash dividends declared per common share	$ 0.125	$ 0.125	$ 0.250	$ 0.250