Consolidated Statement of Stockholders' Equity - USD ($)	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Dec. 31, 2013	$ 11,983,790	$ 678,360	$ 57,655,031	$ (61,225,185)	$ 43,769,485	$ (2,506,248)	$ 50,355,233
Net income					5,782,696		5,782,696
Change in unrealized gain (loss) on available-for-sale securities, net of income taxes						2,057,827	2,057,827
Preferred stock redeemed	(12,000,000)						(12,000,000)
Preferred stock discount accretion	16,210				(16,210)
Preferred stock dividends (5%)					(338,000)		(338,000)
Dividends on common stock					(648,280)		(648,280)
Stock award plans			(644,722)	886,911			242,189
Stock options exercised		3,960	206,910				210,870
Proceeds from issuance of common stock			(6,850,673)	22,664,985			15,814,312
Balance at Dec. 31, 2014		682,320	50,366,546	(37,673,289)	48,549,691	(448,421)	61,476,847
Net income					5,716,767		5,716,767
Change in unrealized gain (loss) on available-for-sale securities, net of income taxes						(235,535)	(235,535)
Dividends on common stock					(1,008,332)		(1,008,332)
Stock award plans			(108,631)	394,220			285,589
Stock options exercised		3,580	183,549				187,129
Balance at Dec. 31, 2015		685,900	50,441,464	(37,279,069)	53,258,126	(683,956)	66,422,465
Net income					5,594,011		5,594,011
Change in unrealized gain (loss) on available-for-sale securities, net of income taxes						(625,285)	(625,285)
Dividends on common stock					(1,504,855)		(1,504,855)
Stock award plans			26,463	347,319			373,782
Stock options exercised		1,650	84,150				85,800
Balance at Dec. 31, 2016		687,550	50,552,077	(37,303,288)	57,347,282	(1,309,241)	69,974,380
Treasury stock purchased				$ (371,538)			$ (371,538)