Consolidated Statements of Changes in Shareholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Gain (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2016	$ 4,293,835	$ 31,701,533	$ 30,333,410	$ (1,785,991)	$ (26,120,453)	$ 38,422,334
Net Income			3,807,492			3,807,492
Comprehensive income (loss):
Changes in net gain on securities available for sale				93,675		93,675
Changes in net gain on pension plan benefits				62,697		62,697
Cash dividend declared per share			(1,120,872)			(1,120,872)
Purchase of treasury stock					(122,340)	(122,340)
Balance at Dec. 31, 2017	4,293,835	31,701,533	33,020,030	(1,629,619)	(26,242,793)	41,142,986
Net Income			4,647,119			4,647,119
Comprehensive income (loss):
Changes in net gain on securities available for sale				(525,702)		(525,702)
Changes in net gain on pension plan benefits				(32,075)		(32,075)
Cash dividend declared per share			(1,196,332)			(1,196,332)
Purchase of treasury stock					(306,032)	(306,032)
Adjustment to correct immaterial misstatement of deferred compensation expense and cash surrender value in prior periods	(128,647)	(128,647)
Issue of restricted stock awards		(306,032)			306,032
Stock-based compensation		17,627				17,627
Retirement of treasury stock	(1,748,059)	(12,994,133)	(11,500,601)		26,242,793
Balance at Dec. 31, 2018	2,545,776	18,418,995	24,841,569	(2,187,396)		43,618,944
Net Income			5,290,240			5,290,240
Comprehensive income (loss):
Changes in net gain on securities available for sale				1,654,355		1,654,355
Changes in net gain on pension plan benefits				1,086,510		1,086,510
Cash dividend declared per share			(1,221,766)			(1,221,766)
Issue of restricted stock awards	4,456	(4,456)
Stock-based compensation		74,623				74,623
Restricted stock awards sold to plan		(11,929)				(11,929)
Forfeitures of restricted awards	(1,722)	1,722
Balance at Dec. 31, 2019	$ 2,548,510	$ 18,478,955	$ 28,910,043	$ 553,469		$ 50,490,977