Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock Outstanding [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2016	6,397,000
Balance at Dec. 31, 2016		$ 115	$ 80,822	$ 7,476	$ (122,835)	$ 128,580	$ 94,158
NET INCOME						38,899	38,899
Other comprehensive income (loss), net of tax				(32)			$ (32)
Exercise of stock options-shares issued including tax benefits (in shares)	11,000						11,063
Exercise of stock options-shares issued including tax benefits			123				$ 123
Restricted stock issued (in shares)	7,000
Restricted stock issued
Treasury stock repurchases (in shares)	(254,000)
Treasury stock repurchases					(6,348)		(6,348)
Share-based compensation			614				614
Balance (in shares) at Dec. 31, 2017	6,161,000
Balance at Dec. 31, 2017		115	81,559	7,444	(129,183)	167,669	127,604
Cumulative effect adjustment – ASU 2016-09						190	190
NET INCOME						23,994	$ 23,994
Exercise of stock options-shares issued including tax benefits (in shares)	45,000						45,005
Exercise of stock options-shares issued including tax benefits		1	485				$ 486
Restricted stock issued (in shares)	38,000
Restricted stock issued
Treasury stock repurchases (in shares)	(287,000)
Treasury stock repurchases					(13,369)		(13,369)
Share-based compensation			732				732
Cumulative effect adjustment – ASU 2016-01				(7,444)		7,444
Balance (in shares) at Dec. 31, 2018	5,957,000
Balance at Dec. 31, 2018		116	82,776	0	(142,552)	199,107	139,447
NET INCOME						7,900	$ 7,900
Exercise of stock options-shares issued including tax benefits (in shares)
Restricted stock issued (in shares)	44,000
Restricted stock issued		1					$ 1
Treasury stock repurchases (in shares)	(252,000)
Treasury stock repurchases					(14,285)		(14,285)
Share-based compensation			912				912
Balance (in shares) at Dec. 31, 2019	5,749,000
Balance at Dec. 31, 2019		$ 117	$ 83,688	$ 0	$ (156,837)	$ 207,007	$ 133,975