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Note 6 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Note 6 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]    
Cash and due from banks $ 44,930,836 $ 41,742,321
Federal funds sold 15,740,000 19,850,000
Interest-bearing deposits at financial institutions 41,489,171 36,313,965
Investment securities:    
Held to maturity 261,129,586  
Held to maturity 264,414,722 255,691,285
Available for sale 276,187,867 323,434,982
Derivative instruments 450,651 856,024
Deposits:    
Deposits 1,989,573,089 1,880,666,184
Other borrowings 100,000,000 110,000,000
Fair Value, Inputs, Level 1 [Member]    
Note 6 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]    
Cash and due from banks 44,930,836 41,742,321
Fair Value, Inputs, Level 2 [Member]    
Note 6 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]    
Federal funds sold 15,740,000 19,850,000
Federal funds sold 15,740,000 19,850,000
Investment securities:    
Held to maturity 261,129,586 253,674,159
Held to maturity 264,414,722 255,691,285
Loans/leases receivable, net 1,841,827,043 1,767,672,541
Loans/leases receivable, net, fair value (4,601,131) 1,764,178,772
Derivative instruments 450,651 856,024
Deposits:    
Short-term borrowings 64,022,811 144,662,716
Short-term borrowings 64,022,811 144,662,716
FHLB advances 150,500,000 151,000,000
FHLB advances 152,206,000 153,143,000
Other borrowings 100,000,000 110,000,000
Other borrowings 106,466,000 116,061,000
Junior subordinated debentures 33,378,402 38,499,052
Junior subordinated debentures 24,520,003 27,642,093
Fair Value, Inputs, Level 2 [Member] | Nonmaturity Deposits [Member]    
Deposits:    
Deposits 1,586,207,114 1,516,599,081
Deposits, fair value 1,586,207,114 1,516,599,081
Fair Value, Inputs, Level 2 [Member] | Time Deposits [Member]    
Deposits:    
Deposits 403,365,975 364,067,103
Deposits, fair value 404,278,000 364,192,000
Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member]    
Investment securities:    
Derivative instruments 450,651 856,024
Fair Value, Inputs, Level 2 [Member] | Interest-bearing Deposits [Member]    
Note 6 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]    
Interest-bearing deposits at financial institutions 41,489,171 36,313,965
Interest-bearing deposits at financial institutions 41,489,171 36,313,965
Fair Value, Inputs, Level 3 [Member]    
Investment securities:    
Loans/leases receivable, net 4,601,131 4,209,228
Loans/leases receivable, net, fair value $ 4,969,221 $ 4,545,966