Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Beginning balance at Dec. 31, 2019	$ 5,142	$ 24,898	$ 43,954	$ 516	$ (803)	$ 73,707
Beginning balance, shares at Dec. 31, 2019	5,099,729
Net income			5,602			5,602
Other comprehensive income (loss)				3,007		3,007
Cash dividends			5	(5)
Stock-based compensation			(4,465)			$ (4,465)
Forfeiture of restricted stock, Shares						(565)
Purchase of treasury stock					(1,452)	$ (1,452)
Purchase of treasury stock, shares	(88,277)					(87,712)
Treasury stock issued for stock plans		(6)			76	$ 70
Treasury stock issued for stock plans, shares	4,459
Common stock issued for stock plans	$ 9	(9)
Common stock issued for stock plans, shares	9,530
Ending balance at Dec. 31, 2020	$ 5,151	25,011	45,096	3,518	(2,179)	$ 76,597
Ending balance, shares at Dec. 31, 2020	5,025,441					5,025,441
Net income			6,604			$ 6,604
Other comprehensive income (loss)				(6,883)		(6,883)
Cash dividends			(4,402)			(4,402)
Stock-based compensation		158				$ 158
Forfeiture of restricted stock, Shares						(200)
Purchase of treasury stock					(861)	$ (861)
Purchase of treasury stock, shares	(50,682)					(50,482)
Treasury stock issued for stock plans		(161)			238	$ 77
Treasury stock issued for stock plans, shares	13,783
Ending balance at Dec. 31, 2021	$ 5,151	$ 25,008	$ 47,298	$ (3,365)	$ (2,802)	$ 71,290
Ending balance, shares at Dec. 31, 2021	4,988,542					4,988,542