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, 2016	3,957,135
Balance, Beg at Dec. 31, 2016	$ 82,177	$ 39	$ 3,767	$ 85,716	$ (708)	$ (6,637)
Net earnings	6,021	0	0	6,021	0	0
Other Comprehensive Income (Loss), Net Of Tax	850	0	0	0	850	0
Cash dividends paid	(2,514)	0	0	(2,514)	0	0
Sale of treasury stock	4	0	4	0	0	0
Balance, End at Sep. 30, 2017	$ 86,538	39	3,771	89,223	142	(6,637)
Balance, shares at Sep. 30, 2017	3,957,135
Balance, shares at Dec. 31, 2017	3,957,135
Balance, Beg at Dec. 31, 2017	$ 86,906	39	3,771	90,299	(566)	(6,637)
Net earnings	6,434	0	0	6,434	0	0
Other Comprehensive Income (Loss), Net Of Tax	(5,267)	0	0	0	(5,267)	0
Cash dividends paid	(2,624)	0	0	(2,624)	0	0
Sale of treasury stock	10	0	8	0	0	2
Balance, End at Sep. 30, 2018	$ 85,459	$ 39	$ 3,779	$ 94,109	$ (5,833)	$ (6,635)
Balance, shares at Sep. 30, 2018	3,957,135