CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Total
Balance at Dec. 31, 2020	$ 191	$ 34,498	$ 342,250	$ (8,872)	$ 368,067
Balance (in shares) at Dec. 31, 2020	18,426,130
Increase (Decrease) in Stockholders' Equity
Exercise of stock options, net		1,143		1,266	2,409
Exercise of stock options, net (in shares)	91,831
Stock-based compensation expense		1,280			1,280
Net income			8,154		8,154
Balance at Mar. 31, 2021	$ 191	36,921	350,404	(7,606)	379,910
Balance (in shares) at Mar. 31, 2021	18,517,961
Balance at Dec. 31, 2021	$ 191	41,426	410,738	(4,341)	$ 448,014
Balance (in shares) at Dec. 31, 2021	18,764,540				18,764,540
Increase (Decrease) in Stockholders' Equity
Exercise of stock options, net		19		2,458	$ 2,477
Exercise of stock options, net (in shares)	191,035
Restricted stock granted		1,658		262	1,920
Restricted stock granted, shares	19,549
Purchase of company common stock				(6,500)	(6,500)
Purchase of company common stock, shares	(100,000)
Stock-based compensation expense		1,160			1,160
Net income			18,118		18,118
Balance at Mar. 31, 2022	$ 191	$ 44,263	$ 428,856	$ (8,121)	$ 465,189
Balance (in shares) at Mar. 31, 2022	18,875,124				18,875,124