Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2013	$ 24,671	$ 129,423	$ (759)	$ (103,993)
Balance, Shares at Dec. 31, 2013		11,294,682
Net income	(393)
Balance at Mar. 31, 2014	24,879
Balance at Dec. 31, 2013	24,671	$ 129,423	(759)	(103,993)
Balance, Shares at Dec. 31, 2013		11,294,682
Exercise of stock options	$ 666	$ 666
Exercise of stock options, Shares	393,128	327,050
Share-based compensation, including issuance of restricted stock	$ 982	$ 982
Share-based compensation, including issuance of restricted stock, Shares		145,845
Net income	2,345			2,345
Foreign currency translation adjustment, net of tax	(86)		(86)
Change in unrealized gains on investments, net of tax	(1)		(1)
Balance at Dec. 31, 2014	$ 28,577	$ 131,071	(846)	(101,648)
Balance, Shares at Dec. 31, 2014	11,767,577	11,767,577
Balance at Mar. 31, 2014	$ 24,879
Net income	651
Balance at Jun. 30, 2014	26,086
Net income	691
Balance at Sep. 30, 2014	26,940
Net income	1,396
Balance at Dec. 31, 2014	$ 28,577	$ 131,071	(846)	(101,648)
Balance, Shares at Dec. 31, 2014	11,767,577	11,767,577
Net income	$ 1,823
Balance at Mar. 31, 2015	30,662
Balance at Dec. 31, 2014	$ 28,577	$ 131,071	(846)	(101,648)
Balance, Shares at Dec. 31, 2014	11,767,577	11,767,577
Exercise of stock options	$ 744	$ 744
Exercise of stock options, Shares	250,196	250,196
Share-based compensation, including issuance of restricted stock	$ 1,516	$ 1,516
Share-based compensation, including issuance of restricted stock, Shares		74,825
Net income	6,093			6,093
Foreign currency translation adjustment, net of tax	(19)		(19)
Change in unrealized gains on investments, net of tax	(4)		(4)
Balance at Dec. 31, 2015	$ 36,907	$ 133,331	(869)	(95,555)
Balance, Shares at Dec. 31, 2015	12,092,598	12,092,598
Balance at Mar. 31, 2015	$ 30,662
Net income	1,885
Balance at Jun. 30, 2015	33,189
Net income	1,245
Balance at Sep. 30, 2015	35,077
Net income	1,140
Balance at Dec. 31, 2015	$ 36,907	$ 133,331	$ (869)	$ (95,555)
Balance, Shares at Dec. 31, 2015	12,092,598	12,092,598