Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2014	$ 28,577	$ 131,071	$ (846)	$ (101,648)
Balance, Shares at Dec. 31, 2014		11,767,577
Net income (loss)	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
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 (loss)	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 (loss)	1,885
Balance at Jun. 30, 2015	33,189
Net income (loss)	1,245
Balance at Sep. 30, 2015	35,077
Net income (loss)	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
Net income (loss)	$ 500
Balance at Mar. 31, 2016	37,873
Balance at Dec. 31, 2015	$ 36,907	$ 133,331	(869)	(95,555)
Balance, Shares at Dec. 31, 2015	12,092,598	12,092,598
Exercise of stock options	$ 1,082	$ 1,082
Exercise of stock options, Shares	371,845	371,845
Share-based compensation, including issuance of restricted stock	$ 1,247	$ 1,247
Share-based compensation, including issuance of restricted stock, Shares		67,905
Net income (loss)	(1,052)			(1,052)
Foreign currency translation adjustment, net of tax	(79)		(79)
Change in unrealized gains on investments, net of tax	7		7
Balance at Dec. 31, 2016	$ 38,112	$ 135,660	(941)	(96,607)
Balance, Shares at Dec. 31, 2016	12,532,348	12,532,348
Balance at Mar. 31, 2016	$ 37,873
Net income (loss)	(185)
Balance at Jun. 30, 2016	38,166
Net income (loss)	(106)
Balance at Sep. 30, 2016	38,790
Net income (loss)	(1,261)
Balance at Dec. 31, 2016	$ 38,112	$ 135,660	$ (941)	$ (96,607)
Balance, Shares at Dec. 31, 2016	12,532,348	12,532,348