Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Dec. 31, 2016	20,040,348				1,452,810
Balance at Dec. 31, 2016	$ 200	$ 85,378	$ 15,335	$ (4,583)	$ (8,830)	$ 87,500
Net income			17,177			17,177
Other comprehensive income				2,294		2,294
Issuance of common stock for stock options exercised (in shares)	635,503
Issuance of common stock for stock options exercised	$ 7	5,493				5,500
Vested restricted stock units (in shares)	69,190
Vested restricted stock units
Stock-based compensation expense		2,256				2,256
Repurchase of common stock at cost (in shares)					27,291
Repurchase of common stock at cost					$ (778)	(778)
Common stock cash dividend paid			(4,179)			(4,179)
Balance (in shares) at Dec. 31, 2017	20,745,041				1,480,101
Balance at Dec. 31, 2017	$ 207	93,127	28,333	(2,289)	$ (9,608)	109,770
Net income			22,943			22,943
Other comprehensive income				(1,611)		(1,611)
Issuance of common stock for stock options exercised (in shares)	303,379
Issuance of common stock for stock options exercised	$ 4	2,966				2,970
Vested restricted stock units (in shares)	61,804
Vested restricted stock units
Stock-based compensation expense		2,349				2,349
Repurchase of common stock at cost (in shares)					21,410
Repurchase of common stock at cost					$ (741)	(741)
Common stock cash dividend paid			(5,445)			(5,445)
Balance (in shares) at Dec. 31, 2018	21,110,224				1,501,511
Balance at Dec. 31, 2018	$ 211	98,442	45,831	(3,900)	$ (10,349)	130,235
Net income			17,934			17,934
Other comprehensive income				(107)		$ (107)
Issuance of common stock for stock options exercised (in shares)	509,693					509,693	[1]
Issuance of common stock for stock options exercised	$ 6	4,850				$ 4,856
Vested restricted stock units (in shares)	59,010
Vested restricted stock units
Stock-based compensation expense		2,642				2,642
Repurchase of common stock at cost (in shares)					20,524
Repurchase of common stock at cost					$ (683)	(683)
Common stock cash dividend paid			(6,736)			(6,736)
Balance (in shares) at Dec. 31, 2019	21,678,927				1,522,035
Balance at Dec. 31, 2019	$ 217	$ 105,934	$ 57,029	$ (4,007)	$ (11,032)	$ 148,141

[1] The aggregate intrinsic value of shares exercised represents the difference between the exercise price and the closing price of our stock on the date of exercise.