Consolidated Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Non-Voting Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2019	$ 54		$ 86,903	$ (2,932)	$ 28	$ (3,389)	$ 80,664
Net income				22,260			22,260
Other comprehensive income (loss)					94		94
Issuance of stock based incentive plan shares, net of forfeitures
Restricted stock expense, net of forfeitures			590				590
Stock options exercised			36				36
Acquisition of treasury shares surrendered upon vesting of restricted stock for payment of taxes						(27)	(27)
Purchase of treasury shares						(648)	(648)
Conversion of 12,607 shares of Series C preferred stock to 1,260,700 shares of non-voting common stock		13	(13)
Balance at Sep. 30, 2020	54	13	87,516	19,328	122	(4,064)	102,969
Balance at Jun. 30, 2020	54	13	87,276	9,142	146	(4,064)	92,567
Net income				10,186			10,186
Other comprehensive income (loss)					(24)		(24)
Issuance of stock based incentive plan shares, net of forfeitures
Restricted stock expense, net of forfeitures			240				240
Balance at Sep. 30, 2020	54	13	87,516	19,328	122	(4,064)	102,969
Balance at Dec. 31, 2020	54	13	87,637	26,479	96	(4,069)	110,210
Net income				13,986			13,986
Other comprehensive income (loss)					(59)		(59)
Issuance of stock based incentive plan shares, net of forfeitures
Restricted stock expense, net of forfeitures			527				527
Stock options exercised			106				106
Acquisition of treasury shares surrendered upon vesting of restricted stock for payment of taxes						(43)	(43)
Purchase of treasury shares						(970)	(970)
Cash dividends declared on common stock				(588)			(588)
Balance at Sep. 30, 2021	54	13	88,270	39,877	37	(5,082)	123,169
Balance at Jun. 30, 2021	54	13	88,099	35,997	50	(4,354)	119,859
Net income				4,076			4,076
Other comprehensive income (loss)					(13)		(13)
Issuance of stock based incentive plan shares, net of forfeitures
Restricted stock expense, net of forfeitures			171				171
Acquisition of treasury shares surrendered upon vesting of restricted stock for payment of taxes						(20)	(20)
Purchase of treasury shares						(708)	(708)
Cash dividends declared on common stock				(196)			(196)
Balance at Sep. 30, 2021	$ 54	$ 13	$ 88,270	$ 39,877	$ 37	$ (5,082)	$ 123,169