CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2020	$ 261,160	$ 7,753	$ 204,875	$ 99,062	$ (50,515)	$ (15)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,071			7,071
Cash dividends	(3,886)			(3,886)
Issuance of common shares pursuant to stock-based compensation plan, net	(830)		(2,426)		1,596
Exercise of SARs	(116)		(314)		198
Stock-based compensation expense	693		693
Purchase of common shares	(1,228)				(1,228)
Other comprehensive income (loss)	(3,377)					(3,377)
Ending balance at Mar. 31, 2021	259,487	7,753	202,828	102,247	(49,949)	(3,392)
Beginning balance at Dec. 31, 2021	245,798	7,753	204,276	112,220	(78,904)	453
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,258			8,258
Cash dividends	(3,832)			(3,832)
Issuance of common shares pursuant to stock-based compensation plan, net	(490)		(1,889)		1,399
Exercise of SARs	(85)		(328)		243
Stock-based compensation expense	1,090		1,090
Purchase of common shares	(5,086)				(5,086)
Other comprehensive income (loss)	(28,575)					(28,575)
Ending balance at Mar. 31, 2022	$ 217,078	$ 7,753	$ 203,149	$ 116,646	$ (82,348)	$ (28,122)