Note 19 - Quarterly Results of Operations (Unaudited) - Quarterly Results of Operations (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Total interest income	$ 32,235,657	$ 26,816,735	$ 23,913,284	$ 23,502,059	$ 22,909,799	$ 23,141,112	$ 22,050,612	$ 21,901,730
Interest expense	2,955,992	3,185,958	2,904,471	2,904,537	3,023,654	3,003,586	3,559,776	4,119,513	$ 11,950,958	$ 13,706,529	$ 16,894,128
Net interest income	29,279,665	23,630,777	21,008,813	20,597,522	19,886,145	20,137,526	18,490,836	17,782,217	94,516,777	76,296,724	69,071,128
Provision for loan/lease losses	2,599,345	1,607,986	1,197,850	2,072,985	1,176,516	1,635,263	2,348,665	1,710,456	7,478,166	6,870,900	6,807,000
Noninterest income	7,028,600	10,423,401	6,762,401	6,822,473	6,211,910	6,402,686	5,495,829	6,252,896	31,036,875	24,363,321	21,281,279
Noninterest expense	22,307,178	24,480,483	17,743,753	16,954,498	15,873,423	15,947,091	24,136,229	17,235,279	81,485,912	73,192,022	65,553,900
Income before taxes	11,401,742	7,965,709	8,829,611	8,392,512	9,048,116	8,957,858	(2,498,229)	5,089,378	36,589,574	20,597,123	17,991,507
Federal and state income tax expense	2,872,412	1,858,208	2,153,144	2,019,023	2,263,293	2,468,871	(1,974,411)	911,489	8,902,787	3,669,242	3,038,970
Net income	$ 8,529,330	$ 6,107,501	$ 6,676,467	$ 6,373,489	$ 6,784,823	$ 6,488,987	$ (523,818)	$ 4,177,889	$ 27,686,787	$ 16,927,881	$ 14,952,537
Basic (in dollars per share)	$ 0.65	$ 0.47	$ 0.54	$ 0.54	$ 0.58	$ 0.55	$ (0.05)	$ 0.52	$ 2.20	$ 1.64	$ 1.75
Diluted (in dollars per share)	$ 0.64	$ 0.46	$ 0.53	$ 0.53	$ 0.57	$ 0.55	$ (0.05)	$ 0.52	$ 2.17	$ 1.61	$ 1.72