Note 20 - Parent Company Only Financial Statements (Details) - Condensed Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Cash Flows from Operating Activities:
Net income	$ 14,952,537		$ 14,938,245		$ 12,617,767
Distributions in excess of (less than) earnings of:
Bargain purchase gain on Community National acquisition			(1,841,385)
Accretion of acquisition fair value adjustments	674,539		1,060,708
Stock-based compensation expense	891,619		792,279		849,760
Cash Flows from Investing Activities:
Net increase in interest-bearing deposits at financial instituions	(2,289,765)		(8,660,888)		4,391,112
Calls, maturities and redemptions of securities available for sale	35,247,090		147,264,900		374,292,050
Net cash paid for Community National acquisition		[1]	(6,261,684)	[1]		[1]
Purchase of premises and equipment	(2,035,855)		(2,430,353)		(1,871,942)
Net cash (used in) provided by' investing activities	(129,927,297)		(164,557,224)		(132,781,796)
Cash Flows from Financing Activities:
Net (decrease) increase in other borrowings			(200,000)		8,099
Proceeds from other borrowings term note	10,000,000		10,000,000
Advance (payment) on 364-day revolving note			(5,600,000)		2,000,000
Repayment of Community National's other borrowings at acquisition			3,950,000
Net cash used in financing activities	100,611,611		112,903,315		110,558,615
Net increase (decrease) in cash and due from banks	(3,715,771)		(19,617,656)		8,431,736
Cash and due from banks:
Cash and cash equivalents	38,235,019		41,950,790		61,568,446
Series F Noncumulative Perpetual Preferred Stock [Member] | Parent Company [Member]
Cash Flows from Financing Activities:
Redemption of Preferred Stock, net	(29,823,922)				(10,223,000)
Bank Subsidiaries [Member] | Parent Company [Member]
Distributions in excess of (less than) earnings of:
Distributions in excess of earnings	166,806		5,500,930		(3,706,086)
Nonbank Subsidiaries [Member] | Parent Company [Member]
Distributions in excess of (less than) earnings of:
Distributions in excess of earnings	9		(103)		(132,911)
Beginning of Period [Member] | Parent Company [Member]
Cash and due from banks:
Cash and cash equivalents	7,212,584		1,072,434		3,542,484
End of Period [Member] | Parent Company [Member]
Cash and due from banks:
Cash and cash equivalents	4,499,139		7,212,584		1,072,434
Parent Company [Member]
Cash Flows from Operating Activities:
Net income	14,952,537		14,938,245		12,617,767
Distributions in excess of (less than) earnings of:
Bargain purchase gain on Community National acquisition			(1,841,385)
Accretion of acquisition fair value adjustments	133,905		79,655
Depreciation	100,158		75,182
Other-than-temporary impairment losses on securities					62,400
Stock-based compensation expense	891,619		792,279		849,760
Decrease (increase) in other assets	1,912,597		(725,105)		(437,827)
(Decrease) increase in other liabilities	2,644,458		(2,978,106)		1,938,832
Net cash provided by operating activities	20,802,089		15,841,592		11,191,935
Cash Flows from Investing Activities:
Net increase in interest-bearing deposits at financial instituions	(2,726)		(2,288)		(1,937)
Purchase of securities available for sale	(40,523)		(34,040)		(53,501)
Calls, maturities and redemptions of securities available for sale	71,429
Net cash paid for Community National acquisition			(6,261,684)
Increase in cash from dissolution of VPHC					99,645
Purchase of premises and equipment	(16,618)
Net cash (used in) provided by' investing activities	11,562		(6,298,012)		44,207
Cash Flows from Financing Activities:
Net (decrease) increase in other borrowings	(2,359,207)		(373,446)
Proceeds from other borrowings term note	10,000,000		10,000,000
Advance (payment) on 364-day revolving note			(5,600,000)		2,000,000
Repayment of Community National's other borrowings at acquisition			(3,950,000)
Payment of cash dividends on common and preferred stock	(1,964,608)		(4,062,726)		(4,088,949)
Proceeds from issuance of common stock, net	620,641		582,742		994,174
Purchase of noncontrolling interests					(2,388,417)
Net cash used in financing activities	(23,527,096)		(3,403,430)		(13,706,192)
Net increase (decrease) in cash and due from banks	$ (2,713,445)		$ 6,140,150		$ (2,470,050)

[1] Net cash received at closing totaled $3,025,073