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Note 10 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Note 10 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]    
Cash and due from banks $ 41,053,241 $ 38,235,019
Federal funds sold 34,330,000 46,780,000
Interest-bearing deposits at financial institutions 32,275,631 35,334,682
Investment securities:    
Held to maturity 238,640,598  
Held to maturity 239,420,841 201,113,796
Available for sale 352,134,351 451,659,630
Derivative instruments 784,655 1,487,386
Deposits:    
Deposits 1,855,318,987 1,679,668,013
FHLB advances 133,000,000 203,500,000
Other borrowings 115,000,000 150,282,492
Fair Value, Inputs, Level 1 [Member]    
Note 10 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]    
Cash and due from banks 41,053,241 38,235,019
Fair Value, Inputs, Level 2 [Member]    
Note 10 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]    
Federal funds sold 34,330,000 46,780,000
Federal funds sold 34,330,000 46,780,000
Investment securities:    
Loans/leases receivable, net 1,725,647,545 1,595,384,851
Loans/leases receivable, net, fair value 1,735,872,520 1,606,646,146
Derivative instruments 784,655 1,487,386
Deposits:    
Short-term borrowings 167,564,212 268,351,670
Short-term borrowings 167,564,212 268,351,670
FHLB advances 133,000,000 203,500,000
FHLB advances 135,877,000 208,172,000
Other borrowings 115,000,000 150,282,492
Other borrowings 123,363,000 159,741,000
Junior subordinated debentures 40,526,691 40,423,735
Junior subordinated debentures 28,887,138 28,585,294
Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member]    
Investment securities:    
Derivative instruments 784,655 1,487,386
Fair Value, Inputs, Level 2 [Member] | Interest-bearing Deposits [Member]    
Note 10 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]    
Interest-bearing deposits at financial institutions 32,275,631 35,334,682
Interest-bearing deposits at financial institutions 32,275,631 35,334,682
Fair Value, Inputs, Level 2 [Member] | Nonmaturity Deposits [Member]    
Deposits:    
Deposits 1,469,462,729 1,304,044,099
Deposits, fair value 1,469,462,729 1,304,044,099
Fair Value, Inputs, Level 2 [Member] | Time Deposits [Member]    
Deposits:    
Deposits 385,856,258 375,623,914
Deposits, fair value 386,900,000 376,509,000
Fair Value, Inputs, Level 3 [Member]    
Investment securities:    
Held to maturity 238,640,598 199,879,574
Held to maturity 239,420,841 201,113,796
Loans/leases receivable, net 4,490,480 11,543,854
Loans/leases receivable, net, fair value $ 4,849,718 $ 12,467,362