Note 20 - Parent Company Only Financial Statements (Details) - Condensed Statements of Income - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Income Statements, Captions [Line Items]
Total interest income	$ 22,909,799	$ 23,141,112	$ 22,050,612	$ 21,901,730	$ 22,028,027	$ 21,796,642	$ 21,105,376	$ 21,035,211
Securities gains									$ 798,983	$ 92,363	$ 432,492
Gain on debt extinguishment									300,000
Bargain purchase gain on Community National acquisition											1,841,385
Total income									114,532,976	107,122,613	108,717,634
Interest expense	3,023,654	3,003,586	3,559,776	4,119,513	4,246,814	4,321,311	4,140,033	4,185,970	13,706,529	16,894,128	17,766,521
Salaries and employee benefits									42,967,915	40,337,055	37,510,318
Acquisition and data conversion costs											2,353,162
Income tax benefit	(2,263,293)	(2,468,871)	1,974,411	(911,489)	(344,497)	(1,028,876)	(1,193,312)	(472,285)	(3,669,242)	(3,038,970)	(4,617,942)
Net income	$ 6,784,823	$ 6,488,987	$ (523,818)	$ 4,177,889	$ 2,992,821	$ 4,062,665	$ 4,007,836	$ 3,889,215	16,927,881	14,952,537	14,938,245
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Total interest income									69,774	40,815	43,476
Securities gains									262,800
Gain on debt extinguishment									300,000
Bargain purchase gain on Community National acquisition											1,841,385
Other									(4,436)	7,486	7,942
Total income									22,720,047	20,414,170	22,423,413
Interest expense									1,679,909	1,986,752	1,714,814
Salaries and employee benefits									4,847,507	4,671,719	4,765,762
Professional fees									1,121,094	1,100,714	977,571
Acquisition and data conversion costs											2,037,684
Other									949,041	635,081	642,044
Total expenses									8,597,551	8,394,266	10,137,875
Income before income tax benefit									14,122,496	12,019,904	12,285,538
Income tax benefit									2,805,385	2,932,633	2,652,707
Net income									16,927,881	14,952,537	14,938,245
Bank Subsidiaries [Member] | Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Equity in net income of subsidiaries									22,059,086	20,333,194	20,499,070
Non-bank Subsidiaries [Member] | Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Equity in net income of subsidiaries									$ 32,823	$ 32,675	$ 31,540