Consolidated Statements of Shareholders' Equity - USD ($)		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2016		$ 93,567,000	$ 2,235,000	$ 17,418,000	$ 80,147,000	$ (3,757,000)	$ (2,476,000)
Balance (in shares) at Dec. 31, 2016			3,411,701
Net income		8,289,000			8,289,000
Other comprehensive income (loss), net of tax		(329,000)				(329,000)
Cash dividends declared		(4,253,000)			(4,253,000)
Stock issued in connection with dividend reinvestment and stock purchase plan		973,000	$ 16,000	957,000
Stock issued in connection with dividend reinvestment and stock purchase plan (in shares)			25,048
Stock issued for employee stock purchase plan		$ 91,000	$ 2,000	89,000
Stock issued for employee stock purchase (in shares)		2,660	2,660
Stock issued for options exercised		$ 130,000	$ 5,000	125,000
Stock issued for options exercised (in shares)		13,125	8,699
Stock-based compensation expense		$ 102,000		102,000
Balance at Dec. 31, 2017		98,570,000	$ 2,258,000	18,691,000	84,183,000	(4,086,000)	(2,476,000)
Balance (in shares) at Dec. 31, 2017			3,448,108
Net income		11,335,000			11,335,000
Other comprehensive income (loss), net of tax		(2,495,000)				(2,495,000)
Cash dividends declared		(4,434,000)			(4,434,000)
Equity securities fair value reclassification	[1]				(254,000)	254,000
ASU 2018-02 stranded tax reclassification	[2]				805,000	(805,000)
Stock issued in connection with dividend reinvestment and stock purchase plan		979,000	$ 14,000	965,000
Stock issued in connection with dividend reinvestment and stock purchase plan (in shares)			23,302
Stock issued for employee stock purchase plan		$ 117,000	$ 2,000	115,000
Stock issued for employee stock purchase (in shares)		2,963	2,963
Stock issued for options exercised		$ 159,000	$ 6,000	153,000
Stock issued for options exercised (in shares)		13,850	9,707
Stock-based compensation expense		$ 117,000		117,000
Balance at Dec. 31, 2018		$ 104,348,000	$ 2,280,000	20,041,000	91,635,000	(7,132,000)	(2,476,000)
Balance (in shares) at Dec. 31, 2018		3,484,080	3,484,080
Net income		$ 12,357,000			12,357,000
Other comprehensive income (loss), net of tax		7,389,000				7,389,000
Cash dividends declared		(4,620,000)			(4,620,000)
ASU 2018-02 stranded tax reclassification		805,000
Stock issued in connection with dividend reinvestment and stock purchase plan		863,000	$ 16,000	847,000
Stock issued in connection with dividend reinvestment and stock purchase plan (in shares)			24,264
Stock issued for employee stock purchase plan		$ 111,000	$ 2,000	109,000
Stock issued for employee stock purchase (in shares)		3,310	3,310
Stock issued for options exercised		$ 151,000	$ 5,000	146,000
Stock issued for options exercised (in shares)		14,925	8,113
Stock-based compensation expense		$ 118,000		118,000
Balance at Dec. 31, 2019		$ 120,717,000	$ 2,303,000	$ 21,261,000	$ 99,372,000	$ 257,000	$ (2,476,000)
Balance (in shares) at Dec. 31, 2019		3,519,767	3,519,767

[1] Refer to Note 1, ASU 2016-01

[2] Refer to Note 1, ASU 2018-02