CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)	ADDITIONAL PAID IN CAPITAL [Member]	RETAINED EARNINGS [Member]	TREASURY STOCK [Member]	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Member]	Total
Beginning Balance at Dec. 31, 2015	$ 36,341,744	$ 4,064,834	$ (2,247,415)	$ 992,549	$ 39,151,712
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		3,934,183			3,934,183
Other comprehensive income				556,309	556,309
Exercise of stock options	333,704				333,704
Stock-based compensation expense	58,112				58,112
Cash dividends		(1,974,529)			(1,974,529)
Ending balance at Sep. 30, 2016	36,733,560	6,024,488	(2,247,415)	1,548,858	42,059,491
Beginning Balance at Dec. 31, 2016	36,824,022	6,643,476	(2,247,415)	(607,109)	40,612,974
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		4,053,126			4,053,126
Other comprehensive income				832,782	832,782
Exercise of stock options	294,342				294,342
Stock-based compensation expense	54,404				54,404
Cash dividends		(2,138,160)			(2,138,160)
Ending balance at Sep. 30, 2017	$ 37,172,768	$ 8,558,442	$ (2,247,415)	$ 225,673	$ 43,709,468