Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Total
Balance at Dec. 31, 2020	$ 433	$ 118,269	$ (78,080)	$ 40,622
Balance (in shares) at Dec. 31, 2020	43,347,887
Issuance of common stock upon exercise of stock options	$ 4			4
Issuance of common stock upon exercise of stock options (in shares)	359,505
Stock compensation expense		370		370
Net income			10,201	10,201
Balance at Jun. 30, 2021	$ 437	118,639	(67,879)	51,197
Balance (in shares) at Jun. 30, 2021	43,707,392
Balance at Dec. 31, 2020	$ 433	118,269	(78,080)	40,622
Balance (in shares) at Dec. 31, 2020	43,347,887
Balance at Dec. 31, 2021	$ 448	116,312	(45,821)	70,939
Balance (in shares) at Dec. 31, 2021	44,758,925
Balance at Mar. 31, 2021	$ 434	118,630	(79,156)	39,908
Balance (in shares) at Mar. 31, 2021	43,371,691
Issuance of common stock upon exercise of stock options	$ 3			3
Issuance of common stock upon exercise of stock options (in shares)	335,701
Stock compensation expense		9		9
Net income			11,277	11,277
Balance at Jun. 30, 2021	$ 437	118,639	(67,879)	51,197
Balance (in shares) at Jun. 30, 2021	43,707,392
Balance at Dec. 31, 2021	$ 448	116,312	(45,821)	70,939
Balance (in shares) at Dec. 31, 2021	44,758,925
Issuance of common stock upon exercise of stock options	$ 2	121		123
Issuance of common stock upon exercise of stock options (in shares)	261,162
Stock compensation expense		583		583
Excess tax benefits from exercise of stock options		(73)		(73)
Net income			69,365	69,365
Balance at Jun. 30, 2022	$ 450	116,943	23,544	140,937
Balance (in shares) at Jun. 30, 2022	45,020,087
Balance at Mar. 31, 2022	$ 449	116,713	(16,266)	100,896
Balance (in shares) at Mar. 31, 2022	44,909,704
Issuance of common stock upon exercise of stock options	$ 1	51		52
Issuance of common stock upon exercise of stock options (in shares)	110,383
Stock compensation expense		180		180
Excess tax benefits from exercise of stock options		(1)		(1)
Net income			39,810	39,810
Balance at Jun. 30, 2022	$ 450	$ 116,943	$ 23,544	$ 140,937
Balance (in shares) at Jun. 30, 2022	45,020,087