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, 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 (loss)				(107)		$ (107)
Issuance of common stock for stock options exercised (in shares)	509,693					509,693
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	$ 0	0				0
Stock-based compensation expense		2,642				2,642
Repurchase of common stock for net settlement of equity awards (in shares)					20,524
Repurchase of common stock for net settlement of equity awards					$ (683)	(683)
Common stock cash dividend paid			(6,736)			(6,736)
Repurchase of common stock for net settlement of equity awards					$ (683)	(683)
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
Net income			21,220			21,220
Other comprehensive income (loss)				2,482		$ 2,482
Issuance of common stock for stock options exercised (in shares)	331,958					331,958
Issuance of common stock for stock options exercised	$ 3	5,968				$ 5,971
Vested restricted stock units (in shares)	50,669
Vested restricted stock units	$ 1	0				1
Stock-based compensation expense		3,022				3,022
Repurchase of common stock for net settlement of equity awards (in shares)					16,537
Repurchase of common stock for net settlement of equity awards					$ (570)	(570)
Common stock cash dividend paid			(7,695)			(7,695)
Repurchase of common stock for net settlement of equity awards					$ (570)	(570)
Balance (in shares) at Dec. 31, 2020	22,061,554				1,538,572
Balance at Dec. 31, 2020	$ 221	114,924	70,554	(1,525)	$ (11,602)	172,572
Net income			26,907			26,907
Other comprehensive income (loss)				(1,910)		$ (1,910)
Issuance of common stock for stock options exercised (in shares)	217,121					217,121
Issuance of common stock for stock options exercised	$ 2	4,544				$ 4,546
Vested restricted stock units (in shares)	49,109
Vested restricted stock units	$ 0	0				0
Stock-based compensation expense		3,479				3,479
Repurchase of common stock for net settlement of equity awards (in shares)					16,333
Repurchase of common stock for net settlement of equity awards					$ (802)	(802)
Common stock cash dividend paid			(9,336)			(9,336)
Issuance of common stock, net of issuance costs (in shares)	1,150,000
Issuance of common stock, net of issuance costs	$ 12	58,683				58,695
Repurchase of common stock for net settlement of equity awards					$ (802)	(802)
Balance (in shares) at Dec. 31, 2021	23,477,784				1,554,905
Balance at Dec. 31, 2021	$ 235	$ 181,630	$ 88,125	$ (3,435)	$ (12,404)	$ 254,151