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]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2014	$ 8,074,443	$ 61,668,968	$ 77,876,824	$ (1,935,216)	$ (1,606,510)	$ 144,078,509
Net income			4,177,889			4,177,889
Other comprehensive income (loss), net of tax				2,220,865		2,220,865
Proceeds from issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan	5,679	82,641				88,320
Proceeds from issuance of shares of common stock as a result of stock options exercised	9,688	94,728				104,416
Stock compensation expense		367,775				367,775
Tax benefit of nonqualified stock options exercised		15,651				15,651
Restricted stock awards	26,502	(26,502)
Exchange of shares of common stock in connection with restricted stock vested, net	(3,272)	(54,188)				(57,460)
Balance at Mar. 31, 2015	8,113,040	62,149,073	82,054,713	285,649	(1,606,510)	150,995,965
Balance at Dec. 31, 2014	8,074,443	61,668,968	77,876,824	(1,935,216)	(1,606,510)	144,078,509
Net income						3,654,071
Other comprehensive income (loss), net of tax						(158,056)
Balance at Jun. 30, 2015	11,819,824	122,511,186	81,066,189	(2,093,272)	(1,606,510)	211,697,417
Tax basis adjustment related to the acquisition of noncontrolling interest in m2 Lease Funds
Balance at Mar. 31, 2015	8,113,040	62,149,073	82,054,713	285,649	(1,606,510)	150,995,965
Net income			(523,818)			(523,818)
Other comprehensive income (loss), net of tax				(2,378,921)		(2,378,921)
Common cash dividends declared			(464,706)			(464,706)
Proceeds from issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan	8,558	128,927				137,485
Proceeds from issuance of shares of common stock as a result of stock options exercised	17,240	238,717				255,957
Stock compensation expense		186,751				186,751
Tax benefit of nonqualified stock options exercised		15,827				15,827
Restricted stock awards	1,616	(1,616)
Balance at Jun. 30, 2015	11,819,824	122,511,186	81,066,189	(2,093,272)	(1,606,510)	211,697,417
Proceeds from issuance of shares of common stock, net of issuance costs	3,680,000	59,804,123				63,484,123
Exchange of shares of common stock in connection with stock options exercised	(630)	(10,616)				(11,246)
Balance at Dec. 31, 2015	11,761,083	123,282,851	92,965,645	(2,123,829)		225,885,750
Net income			6,373,489			6,373,489
Other comprehensive income (loss), net of tax				2,525,411		2,525,411
Common cash dividends declared			(470,873)			(470,873)
Proceeds from issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan	5,054	94,560				99,614
Proceeds from issuance of shares of common stock as a result of stock options exercised	30,331	382,639				412,970
Stock compensation expense		382,761				382,761
Tax benefit of nonqualified stock options exercised		22,508				22,508
Restricted stock awards	22,382	(22,382)
Exchange of shares of common stock in connection with restricted stock vested, net	(3,939)	(84,972)				(88,911)
Balance at Mar. 31, 2016	11,814,911	124,057,965	98,868,261	401,582		235,142,719
Balance at Dec. 31, 2015	11,761,083	123,282,851	92,965,645	(2,123,829)		225,885,750
Net income						13,049,956
Other comprehensive income (loss), net of tax						3,706,044
Balance at Jun. 30, 2016	13,057,368	155,453,781	105,024,027	1,582,215		275,117,391
Tax basis adjustment related to the acquisition of noncontrolling interest in m2 Lease Funds						2,132,415
Balance at Mar. 31, 2016	11,814,911	124,057,965	98,868,261	401,582		235,142,719
Net income			6,676,467			6,676,467
Other comprehensive income (loss), net of tax				1,180,633		1,180,633
Common cash dividends declared			(520,701)			(520,701)
Proceeds from issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan	6,982	142,887				149,869
Proceeds from issuance of shares of common stock as a result of stock options exercised	20,975	230,671				251,646
Stock compensation expense		187,569				187,569
Tax benefit of nonqualified stock options exercised		87,858				87,858
Restricted stock awards	(500)	500
Balance at Jun. 30, 2016	13,057,368	155,453,781	105,024,027	1,582,215		275,117,391
Proceeds from issuance of shares of common stock, net of issuance costs	1,215,000	28,613,916				29,828,916
Tax basis adjustment related to the acquisition of noncontrolling interest in m2 Lease Funds		$ 2,132,415				$ 2,132,415