Note 20 - Parent Company Only Financial Statements - Condensed Statements of Income (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
Securities gains									$ 4,592,398	$ 798,983	$ 92,363
Total income									137,504,610	114,366,574	107,246,535
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
Salaries and employee benefits									46,317,060	42,967,915	40,337,055
Business Combination, Acquisition Related Costs									2,441,173
Gains on debt extinguishment									(1,200,000)	(300,000)
Income tax benefit	(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
Parent Company [Member]
Total interest income									74,489	69,774	40,815
Securities gains									37,596	262,801
Other									(2,933)	(4,436)	7,486
Total income									33,609,538	22,420,047	20,414,170
Interest expense									1,735,769	1,679,909	1,986,752
Salaries and employee benefits									4,607,887	4,847,507	4,671,719
Professional fees									949,442	1,121,094	1,100,714
Business Combination, Acquisition Related Costs									1,713,602
Gains on debt extinguishment									(1,200,000)	(300,000)
Other									988,057	949,041	635,081
Total expenses									8,794,757	8,297,551	8,394,266
Income before income tax benefit									24,814,781	14,122,496	12,019,904
Income tax benefit									2,872,006	2,805,385	2,932,633
Net income									27,686,787	16,927,881	14,952,537
Parent Company [Member] | Bank Subsidiaries [Member]
Equity in net income of bank subsidiaries									33,467,712	22,059,086	20,333,194
Parent Company [Member] | Non-bank Subsidiaries [Member]
Equity in net income of bank subsidiaries									$ 32,674	$ 32,823	$ 32,675