Consolidated Statement of Stockholders' Equity - USD ($)	Preferred Stock [Member]	Common Stock [Member]	Common Stock Warrants [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Dec. 31, 2012	$ 11,789,276	$ 678,180	$ 1,377,811	$ 58,267,529	$ (61,369,344)	$ 39,324,292	$ 800,826	$ 50,868,570
Net income						5,239,707		5,239,707
Change in unrealized gain (loss on available-for-sale securities							(3,307,074)	(3,307,074)
Preferred stock discount accretion	194,514					(194,514)
Preferred stock dividends						(600,000)		(600,000)
Common stock warrants repurchased			$ (1,377,811)	(625,439)				(2,003,250)
Stock award plans				3,713	250,795			254,508
Stock options exercised		180		9,228				9,408
Treasury stock purchased					(106,636)			(106,636)
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							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						(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							(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