Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Member	Additional Paid In Capital Member	Retained Earnings Member	Accumulated Other Comprehensive Income Member	Treasury Stock Member
Balance, shares at Dec. 31, 2018		3,643,868
Balance, Beg at Dec. 31, 2018	$ 89,055	$ 39	$ 3,779	$ 95,635	$ (3,763)	$ (6,635)
Net earnings	7,057	0	0	7,057	0	0
Other Comprehensive Income (Loss), Net Of Tax	6,006	0	0	0	6,006	0
Cash dividends paid	2,683	0	0	2,683	0	0
Treasury Stock, acquired	(2,721)	$ 0	0	0	0	(2,721)
Treasury Stock, acquired shares		77,907
Sale of treasury stock	6	$ 0	5	0	0	1
Treasury shares sold		185
Balance, End at Sep. 30, 2019	96,720	$ 39	3,784	100,009	2,243	(9,355)
Balance, shares at Sep. 30, 2019		3,566,146
Balance, shares at Jun. 30, 2019		3,571,828
Balance, Beg at Jun. 30, 2019	94,065	$ 39	3,783	98,694	680	(9,131)
Net earnings	2,207	0	0	2,207	0	0
Other Comprehensive Income (Loss), Net Of Tax	1,563	0	0	0	1,563	0
Cash dividends paid	892	0	0	892	0	0
Treasury Stock, acquired	(224)	$ 0	0	0	0	(224)
Treasury Stock, acquired shares		5,702
Sale of treasury stock	1	$ 0	1	0	0	0
Treasury shares sold		20
Balance, End at Sep. 30, 2019	96,720	$ 39	3,784	100,009	2,243	(9,355)
Balance, shares at Sep. 30, 2019		3,566,146
Balance, shares at Dec. 31, 2019		3,566,146
Balance, Beg at Dec. 31, 2019	98,328	$ 39	3,784	101,801	2,059	(9,355)
Net earnings	5,398	0	0	5,398	0	0
Other Comprehensive Income (Loss), Net Of Tax	5,310	0	0	0	5,310	0
Cash dividends paid	2,728	0	0	2,728	0	0
Sale of treasury stock	6	$ 0	5	0	0	1
Treasury shares sold		130
Balance, End at Sep. 30, 2020	106,314	$ 39	3,789	104,471	7,369	(9,354)
Balance, shares at Sep. 30, 2020		3,566,276
Balance, shares at Jun. 30, 2020		3,566,176
Balance, Beg at Jun. 30, 2020	105,299	$ 39	3,785	103,444	7,386	(9,355)
Net earnings	1,936	0	0	1,936	0	0
Other Comprehensive Income (Loss), Net Of Tax	(17)	0	0	0	(17)	0
Cash dividends paid	(909)	0	0	(909)	0	0
Sale of treasury stock	5	$ 0	4	0	0	1
Treasury shares sold		100
Balance, End at Sep. 30, 2020	$ 106,314	$ 39	$ 3,789	$ 104,471	$ 7,369	$ (9,354)
Balance, shares at Sep. 30, 2020		3,566,276