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Note 10 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities - USD ($)
Jun. 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 $ 39,994,818 $ 38,235,019
Federal funds sold 22,555,000 46,780,000
Interest-bearing deposits at financial institutions 47,682,823 35,334,682
Investment securities:    
Held to maturity 225,138,234  
Held to maturity 223,541,181 201,113,796
Available for sale 367,229,783 451,659,630
Derivative instruments 1,223,973 1,487,386
Deposits:    
Deposits 1,836,767,070 1,679,668,013
FHLB advances 132,500,000 203,500,000
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 39,994,818 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 22,555,000 46,780,000
Federal funds sold 22,555,000 46,780,000
Investment securities:    
Loans/leases receivable, net 1,685,063,461 1,595,384,851
Loans/leases receivable, net, fair value 1,691,009,263 1,606,646,146
Derivative instruments 1,223,973 1,487,386
Deposits:    
Short-term borrowings 168,574,852 268,351,670
Short-term borrowings 168,574,852 268,351,670
FHLB advances 132,500,000 203,500,000
FHLB advances 135,688,000 208,172,000
Other borrowings 115,000,000 150,282,492
Other borrowings 122,312,000 159,741,000
Junior subordinated debentures 40,492,319 40,423,735
Junior subordinated debentures 28,792,716 28,585,294
Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member]    
Investment securities:    
Derivative instruments 1,223,973 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 47,682,823 35,334,682
Interest-bearing deposits at financial institutions 47,682,823 35,334,682
Fair Value, Inputs, Level 2 [Member] | Nonmaturity Deposits [Member]    
Deposits:    
Deposits 1,419,075,749 1,304,044,099
Deposits, fair value 1,419,075,749 1,304,044,099
Fair Value, Inputs, Level 2 [Member] | Time Deposits [Member]    
Deposits:    
Deposits 417,691,321 375,623,914
Deposits, fair value 418,228,000 376,509,000
Fair Value, Inputs, Level 3 [Member]    
Investment securities:    
Held to maturity 225,138,234 199,879,574
Held to maturity 223,541,181 201,113,796
Loans/leases receivable, net 4,174,737 11,543,854
Loans/leases receivable, net, fair value $ 4,508,716 $ 12,467,362