Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2014	$ 4,293,835	$ 31,701,533	$ 25,014,980	$ (561,171)	$ (26,113,795)	$ 34,335,382
Net Income			3,373,635			3,373,635
Comprehensive income (loss):
Changes in net gain on securities available for sale				88,951		88,951
Changes in net gain (loss) on pension plan benefits				(681,143)		(681,143)
Cash dividend declared per share			(1,019,135)			(1,019,135)
Balance at Dec. 31, 2015	4,293,835	31,701,533	27,369,480	(1,153,363)	(26,113,795)	36,097,690
Net Income			4,033,977			4,033,977
Comprehensive income (loss):
Changes in net gain on securities available for sale				(559,826)		(559,826)
Changes in net gain (loss) on pension plan benefits				(72,802)		(72,802)
Cash dividend declared per share			(1,070,047)			(1,070,047)
Purchase of treasury stock					(6,658)	(6,658)
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 (loss) 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