Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2017	7,287,500
Balance at Dec. 31, 2017	$ 73	$ 6,987	$ 62,116
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			25,000	$ 25,000
Capital contribution		137
Common stock issued, net of offering costs (in shares)	2,900,000
Common stock issued, net of offering costs	$ 29	50,125
Reclassification of undistributed S Corporation earnings		22,872	(22,872)
Shares issued for restricted stock units (in shares)	0
Common stock acquired and canceled (in shares)	0
Common stock acquired and canceled	$ 0		0
Stock-based compensation expense		154
Cash dividends declared ($0.41, $0.60, $7.71 per share)			(56,155)
Balance (in shares) at Dec. 31, 2018	10,187,500
Balance at Dec. 31, 2018	$ 102	80,275	8,089	88,466
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			8,225	8,225
Capital contribution		0
Common stock issued, net of offering costs (in shares)	0
Common stock issued, net of offering costs	$ 0	0
Reclassification of undistributed S Corporation earnings		0	0
Shares issued for restricted stock units (in shares)	19,431
Common stock acquired and canceled (in shares)	(149,425)
Common stock acquired and canceled	$ (1)		(2,645)
Stock-based compensation expense		12,116
Cash dividends declared ($0.41, $0.60, $7.71 per share)			(6,035)
Balance (in shares) at Dec. 31, 2019	10,057,506
Balance at Dec. 31, 2019	$ 101	92,391	7,634	100,126
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			19,266	19,266
Capital contribution		0
Common stock issued, net of offering costs (in shares)	0
Common stock issued, net of offering costs	$ 0	0
Reclassification of undistributed S Corporation earnings		0	0
Shares issued for restricted stock units (in shares)	19,437
Common stock acquired and canceled (in shares)	(1,032,178)
Common stock acquired and canceled	$ (11)		(9,065)
Stock-based compensation expense		771
Cash dividends declared ($0.41, $0.60, $7.71 per share)			(3,768)
Balance (in shares) at Dec. 31, 2020	9,044,765
Balance at Dec. 31, 2020	$ 90	$ 93,162	$ 14,067	$ 107,319