Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Total
Balances at Dec. 31, 2020	$ 666	$ 29,457	$ 268,186	$ (55,117)	$ 243,192
Balances (in shares) at Dec. 31, 2020	5,648,084
Increase (Decrease) in Stockholders' Equity
Stock options exercised	$ 1	83			84
Stock options exercised (in shares)	5,310
Stock-based compensation	$ 2	2,234			2,236
Stock-based compensation (in shares)	18,279
Treasury shares purchased				(731)	(731)
Treasury shares purchased (in shares)	(5,661)
Cash dividends paid			(3,620)		(3,620)
Net income			37,045		37,045
Balances at Dec. 31, 2021	$ 669	31,774	301,611	(55,848)	278,206
Balances (in shares) at Dec. 31, 2021	5,666,012
Increase (Decrease) in Stockholders' Equity
Stock options exercised		120			120
Stock options exercised (in shares)	2,400
Stock-based compensation	$ 2	2,634			2,636
Stock-based compensation (in shares)	19,297
Treasury shares purchased				(767)	(767)
Treasury shares purchased (in shares)	(5,630)
Cash dividends paid			(4,536)		(4,536)
Net income			45,429		45,429
Balances at Dec. 31, 2022	$ 671	34,528	342,504	(56,615)	321,088
Balances (in shares) at Dec. 31, 2022	5,682,079
Increase (Decrease) in Stockholders' Equity
Stock options exercised	$ 1	112			113
Stock options exercised (in shares)	9,288
Stock-based compensation	$ 2	3,180			3,182
Stock-based compensation (in shares)	18,753
Treasury shares purchased				(1,274)	(1,274)
Treasury shares purchased (in shares)	(5,564)
Cash dividends paid			(4,554)		(4,554)
Net income			74,549		74,549
Balances at Dec. 31, 2023	$ 674	$ 37,820	$ 412,499	$ (57,889)	$ 393,104
Balances (in shares) at Dec. 31, 2023	5,704,556