CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Total
Balance at Dec. 31, 2019	$ 7,753	$ 205,397	$ 90,341	$ (45,381)	$ (13,920)	$ 244,190
Net income			7,545			7,545
Cash dividends			(3,918)			(3,918)
Issuance of common shares pursuant to stock-based compensation plan, net		(2,075)		948		(1,127)
Exercise of SARs		(243)		141		(102)
Stock-based compensation expense		722				722
Purchase of common shares				(5,508)		(5,508)
Other comprehensive loss					(519)	(519)
Balance at Mar. 31, 2020	7,753	203,801	93,968	(49,800)	(14,439)	241,283
Balance at Dec. 31, 2020	7,753	204,875	99,062	(50,515)	(15)	261,160
Net income			7,071			7,071
Cash dividends			(3,886)			(3,886)
Issuance of common shares pursuant to stock-based compensation plan, net		(2,426)		1,596		(830)
Exercise of SARs		(314)		198		(116)
Stock-based compensation expense		693				693
Purchase of common shares				(1,228)		(1,228)
Other comprehensive loss					(3,377)	(3,377)
Balance at Mar. 31, 2021	$ 7,753	$ 202,828	$ 102,247	$ (49,949)	$ (3,392)	$ 259,487