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, 2017	$ 4,811	$ 18,565	$ 40,876	$ (4,034)	$ (831)	$ 59,387
Beginning balance, shares at Dec. 31, 2017	4,767,656
Net income			5,904			5,904
Other comprehensive income (loss)				(109)		(109)
Reclassification for ASU 2016-01			156	(156)
Cash dividends at $0.88 per share			(4,411)			(4,411)
Stock-based compensation		82				82
Purchase of treasury stock					$ (70)	(70)
Purchase of treasury stock, shares	(3,416)				(3,416)
Treasury stock issued for stock plans		(8)			$ 98	90
Treasury stock issued for stock plans, shares	5,170
Common stock issued for stock plans	$ 8	34				$ 42
Common stock issued for stock plans, shares	7,354					2,134
Common stock issued for acquisition	$ 315	6,148				$ 6,463
Common stock issued acquisition, shares	315,284
Ending balance at Dec. 31, 2018	$ 5,134	24,821	42,525	(4,299)	(803)	$ 67,378
Ending balance, shares at Dec. 31, 2018	5,092,048					5,092,048
Net income			5,835			$ 5,835
Other comprehensive income (loss)				4,898		4,898
Reclassification for ASU			83	(83)
Cash dividends at $0.88 per share			(4,489)			(4,489)
Stock-based compensation		113				$ 113
Forfeiture of restricted stock, Shares	(800)					(800)
Purchase of treasury stock					$ (428)	$ (428)
Purchase of treasury stock, shares	(21,508)				(21,508)
Treasury stock issued for stock plans		(28)			$ 428	$ 400
Treasury stock issued for stock plans, shares	22,489					1,880
Common stock issued for stock plans	$ 8	(8)
Common stock issued for stock plans, shares	7,500
Ending balance at Dec. 31, 2019	$ 5,142	$ 24,898	$ 43,954	$ 516	$ (803)	$ 73,707
Ending balance, shares at Dec. 31, 2019	5,099,729					5,099,729