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Note 6 - Fair Value - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and due from banks $ 61,213,134 $ 41,742,321
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and due from banks 61,213,134 41,742,321
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest-bearing Deposits [Member]    
Interest-bearing deposits at financial institutions 75,025,417 36,313,965
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest Rate Cap [Member]    
Interest rate caps 221,233 856,024
Interest rate swaps - assets 221,233 856,024
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]    
Interest rate caps 9,386,262 3,044,525
Interest rate swaps - assets 9,386,262 3,044,525
Interest rate swaps - liabilities 9,386,262 3,044,525
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Non-maturity Deposits [Member]    
Nonmaturity deposits 2,103,706,174 1,516,599,081
Deposits 2,103,706,174 1,516,599,081
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Time Deposits [Member]    
Nonmaturity deposits 491,206,579 364,067,103
Deposits 491,206,579 364,067,103
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Federal funds sold 21,022,000 19,850,000
HTM 306,740,174 253,674,159
AFS 258,190,081 323,434,982
Loans/leases receivable, net 2,324,486,610 1,767,672,541
Short-term borrowings 60,015,417 144,662,716
FHLB advances 138,642,529 151,000,000
Other borrowings 80,000,000 110,000,000
Junior subordinated debentures 33,446,578 38,499,052
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest-bearing Deposits [Member]    
Interest-bearing deposits at financial institutions 75,025,417 36,313,965
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Cap [Member]    
Interest rate caps 221,233 856,024
Interest rate swaps - assets 221,233 856,024
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member]    
Interest rate caps 9,386,262 3,044,525
Interest rate swaps - assets 9,386,262 3,044,525
Interest rate swaps - liabilities 9,386,262 3,044,525
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Non-maturity Deposits [Member]    
Nonmaturity deposits 2,103,706,174 1,516,599,081
Deposits 2,103,706,174 1,516,599,081
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Time Deposits [Member]    
Nonmaturity deposits 491,849,000 364,192,000
Deposits 491,849,000 364,192,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Federal funds sold 21,022,000 19,850,000
HTM 311,494,343 255,691,285
AFS 258,190,081 323,434,982
Loans/leases receivable, net 2,327,955,000 1,764,178,772
Short-term borrowings 60,015,417 144,662,716
FHLB advances 140,153,000 153,143,000
Other borrowings 82,119,000 116,061,000
Junior subordinated debentures 24,768,273 27,642,093
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans/leases receivable, net 7,287,067 4,209,228
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans/leases receivable, net 7,870,032 4,545,966
HTM 311,494,343 255,691,285
AFS $ 258,190,081 $ 323,434,982