CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Total
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-based compensation		651			651
Stock-based compensation (in shares)	2,823
Treasury shares purchased				(86)	(86)
Treasury shares purchased (in shares)	(712)
Cash dividends paid			(1,133)		(1,133)
Net income			8,668		8,668
Balances at Mar. 31, 2022	$ 669	32,425	309,146	(55,934)	286,306
Balances (in shares) at Mar. 31, 2022	5,668,123
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
Net income					34,632
Balances at Sep. 30, 2022	$ 669	33,826	332,841	(55,934)	311,402
Balances (in shares) at Sep. 30, 2022	5,673,574
Balances at Mar. 31, 2022	$ 669	32,425	309,146	(55,934)	286,306
Balances (in shares) at Mar. 31, 2022	5,668,123
Increase (Decrease) in Stockholders' Equity
Stock options exercised		120			120
Stock options exercised (in shares)	2,400
Stock-based compensation		640			640
Stock-based compensation (in shares)	3,087
Cash dividends paid			(1,134)		(1,134)
Net income			10,238		10,238
Balances at Jun. 30, 2022	$ 669	33,185	318,250	(55,934)	296,170
Balances (in shares) at Jun. 30, 2022	5,673,610
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		641			641
Stock-based compensation (in shares)	(36)
Cash dividends paid			(1,135)		(1,135)
Net income			15,726		15,726
Balances at Sep. 30, 2022	$ 669	33,826	332,841	(55,934)	311,402
Balances (in shares) at Sep. 30, 2022	5,673,574
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)	5,762
Stock-based compensation		812			812
Stock-based compensation (in shares)	3,124
Treasury shares purchased				(98)	(98)
Treasury shares purchased (in shares)	(646)
Cash dividends paid			(1,137)		(1,137)
Net income			17,104		17,104
Balances at Mar. 31, 2023	$ 672	35,452	358,471	(56,713)	337,882
Balances (in shares) at Mar. 31, 2023	5,690,319
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
Net income					57,549
Balances at Sep. 30, 2023	$ 672	37,035	396,638	(56,713)	377,632
Balances (in shares) at Sep. 30, 2023	5,697,000
Balances at Mar. 31, 2023	$ 672	35,452	358,471	(56,713)	337,882
Balances (in shares) at Mar. 31, 2023	5,690,319
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		796			796
Stock-based compensation (in shares)	3,182
Cash dividends paid			(1,139)		(1,139)
Net income			19,712		19,712
Balances at Jun. 30, 2023	$ 672	36,248	377,044	(56,713)	357,251
Balances (in shares) at Jun. 30, 2023	5,693,501
Increase (Decrease) in Stockholders' Equity
Stock options exercised (in shares)	3,526
Stock-based compensation		787			787
Stock-based compensation (in shares)	(27)
Cash dividends paid			(1,139)		(1,139)
Net income			20,733		20,733
Balances at Sep. 30, 2023	$ 672	$ 37,035	$ 396,638	$ (56,713)	$ 377,632
Balances (in shares) at Sep. 30, 2023	5,697,000