Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive (Loss) Income	Treasury Stock
Treasury stock, shares							26,998
Common stock, shares issued			11,359,769
Preferred stock, shares outstanding		123,693
Conversion of Stock, Shares Converted		(123,693)
Conversion of Stock, Amount Converted	$ 111	$ (111)
Conversion of Stock, Shares Issued			123,693
Conversion of Stock, Amount Issued				$ 111
BALANCE at Dec. 31, 2013	6,077	111	$ 11	80,690	$ (74,619)	$ (81)	$ (35)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,370				20,370
Exercise of warrants (in shares)			1,407,855
Exercise of warrants	$ 4,948		$ 2	4,946
Repurchase of common stock (in shares)	(1,407,855)						(382,564)
Repurchase of common stock	$ (4,661)						$ (4,661)
Shares issued for stock-based compensation awards (in shares)							25,342
Shares issued for stock-based compensation awards	0			(46)	(74)		$ 120
Dividends declared	(476)				(476)
Elimination of CTA upon dissolution	0
Foreign currency translation adjustments	143					143
Unrealized loss on available-for-sale securities	0
Stock-based compensation	49			49
BALANCE at Dec. 31, 2014	26,450	$ 0	$ 13	85,750	(54,799)	62	$ (4,576)
Treasury stock, shares							384,220
Common stock, shares issued			12,891,317
Preferred stock, shares outstanding		0
Conversion of Stock, Amount Converted	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	47,241				47,241
Exercise of warrants (in shares)			88,097
Exercise of warrants	309			309
Repurchase of common stock (in shares)							(547,042)
Repurchase of common stock	(16,071)						$ (16,071)
Shares issued for stock-based compensation awards (in shares)							91,060
Shares issued for stock-based compensation awards	666			(182)	(380)		$ 1,228
Dividends declared	(1,709)				(1,709)
Elimination of CTA upon dissolution	(82)					(82)
Foreign currency translation adjustments	(79)					(79)
Unrealized loss on available-for-sale securities	(2)					(2)
Stock-based compensation	86			86
BALANCE at Dec. 31, 2015	$ 56,809	$ 0	$ 13	85,963	(9,647)	(101)	$ (19,419)
Treasury stock, shares	(840,202)						(840,202)
Common stock, shares issued	12,979,414		12,979,414
Preferred stock, shares outstanding		0
Conversion of Stock, Amount Converted	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 55,086				55,086
Repurchase of common stock (in shares)	(903,031)						(903,031)
Repurchase of common stock	$ (23,704)						$ (23,704)
Shares issued for stock-based compensation awards (in shares)							51,015
Shares issued for stock-based compensation awards	1,741			507			$ 1,234
Dividends declared	(6,891)				(6,891)
Elimination of CTA upon dissolution	132					132
Foreign currency translation adjustments	(838)					(838)
Unrealized loss on available-for-sale securities	0
Stock-based compensation	104			104
BALANCE at Dec. 31, 2016	$ 82,439	$ 0	$ 13	$ 86,574	$ 38,548	$ (807)	$ (41,889)
Treasury stock, shares	(1,692,218)						(1,692,218)
Common stock, shares issued	12,979,414		12,979,414
Preferred stock, shares outstanding		0