Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Unearned ESOP Shares [Member]	Total
Balance (in shares) at Dec. 31, 2016	3,438,190
Balance at Dec. 31, 2016	$ 34,382	$ 27,161,856	$ 25,700,007	$ (363,437)	$ (1,756,231)	$ 50,776,577
Net income			360,591			360,591
Unrealized gain on available-for-sale securities, net				89,171		89,171
Stock option exercise (in shares)	5,732
Stock option exercise	$ 57	55,257				55,314
Restricted stock awards (in shares)	74,750
Restricted stock awards	$ 748	(748)
Amortization of equity awards		47,577			55,859	103,436
Share repurchase (in shares)	(28,000)
Share repurchase	$ (280)	(414,120)				(414,400)
Balance (in shares) at Dec. 31, 2017	3,490,672
Balance at Dec. 31, 2017	$ 34,907	26,849,822	26,060,598	(274,266)	(1,700,372)	50,970,689
Net income			892,430			892,430
Unrealized gain on available-for-sale securities, net				(502,214)		$ (502,214)
Stock option exercise (in shares)	15,464					15,464
Stock option exercise	$ 155	149,073				$ 149,228
Restricted stock awards (in shares)	429
Restricted stock awards	$ 4	(4)
Amortization of equity awards		344,147			41,893	386,040
Share repurchase (in shares)	(102,500)
Share repurchase	$ (1,025)	(1,571,025)				(1,572,050)
Dividend paid - $1.25 per share			(4,161,114)			(4,161,114)
Balance (in shares) at Sep. 30, 2018	3,404,065
Balance at Sep. 30, 2018	$ 34,041	$ 25,772,013	$ 22,791,914	$ (776,480)	$ (1,658,479)	$ 46,163,009