Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]
Balance (in shares) at Dec. 31, 2015		3,359,794
Balance at Dec. 31, 2015	$ 90,443	$ 2,203	$ 15,973	$ 75,289	$ (546)	$ (2,476)
Net income	2,265			2,265
Other comprehensive income, net of tax	2,750				2,750
Cash dividends declared	(1,012)			(1,012)
Stock issued in connection with dividend reinvestment and stock purchase plan (in shares)		8,657
Stock issued in connection with dividend reinvestment and stock purchase plan	$ 246	$ 5	241
Stock issued for options exercised (in shares)	17,900	13,472
Stock issued for options exercised	$ 235	$ 9	226
Tax benefit of stock options exercised	12		12
Stock-based compensation expense	16		16
Balance (in shares) at Mar. 31, 2016		3,381,923
Balance at Mar. 31, 2016	$ 94,955	$ 2,217	16,468	76,542	2,204	(2,476)
Balance (in shares) at Dec. 31, 2016	3,411,701	3,411,701
Balance at Dec. 31, 2016	$ 93,567	$ 2,235	17,418	80,147	(3,757)	(2,476)
Net income	2,860			2,860
Other comprehensive income, net of tax	329				329
Cash dividends declared	(1,059)			(1,059)
Stock issued in connection with dividend reinvestment and stock purchase plan (in shares)		6,656
Stock issued in connection with dividend reinvestment and stock purchase plan	$ 242	$ 4	238
Stock issued for options exercised (in shares)	10,375	6,399
Stock issued for options exercised	$ 86	$ 4	82
Stock-based compensation expense	$ 18		18
Balance (in shares) at Mar. 31, 2017	3,424,756	3,424,756
Balance at Mar. 31, 2017	$ 96,043	$ 2,243	$ 17,756	$ 81,948	$ (3,428)	$ (2,476)