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Note 5 - Fair Value - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
$ 304,197,006 $ 320,414,899
Securities available for sale, fair value 250,952,021 251,113,139
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and due from banks 56,325,969 70,569,993
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and due from banks 56,325,969 70,569,993
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Federal funds sold 15,798,000 22,257,000
306,694,063 322,909,056
Securities available for sale, fair value 250,952,021 251,113,139
Loans/leases receivable, net 2,392,141,282 2,362,856,277
Short-term borrowings 19,470,096 39,971,387
FHLB advances 106,550,000 137,500,000
Other borrowings 72,000,000 80,000,000
Junior subordinated debentures 33,513,509 33,480,202
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Non-maturity Deposits [Member]    
Nonmaturity deposits 2,288,265,733 2,188,683,349
Deposits 2,288,265,733 2,188,683,349
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Time Deposits [Member]    
Nonmaturity deposits 517,665,766 480,577,924
Deposits 517,665,766 480,577,924
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest Rate Cap [Member]    
Interest rate caps 531,325 576,527
Interest rate swaps - assets 531,325 576,527
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]    
Interest rate caps 2,034,898 2,338,281
Interest rate swaps - assets 2,034,898 2,338,281
Interest rate swaps - liabilities 2,034,898 2,338,281
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest-bearing Deposits [Member]    
Interest-bearing deposits at financial institutions 157,420,706 63,948,925
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Federal funds sold 15,798,000 22,257,000
304,197,006 320,414,899
Securities available for sale, fair value 250,952,021 251,113,139
Loans/leases receivable, net 2,368,029,017 2,344,462,740
Short-term borrowings 19,470,096 39,971,387
FHLB advances 107,283,000 138,338,000
Other borrowings 73,108,000 81,282,000
Junior subordinated debentures 25,075,065 24,881,494
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Non-maturity Deposits [Member]    
Nonmaturity deposits 2,288,265,733 2,188,683,349
Deposits 2,288,265,733 2,188,683,349
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Time Deposits [Member]    
Nonmaturity deposits 519,873,000 479,605,000
Deposits 519,873,000 479,605,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Cap [Member]    
Interest rate caps 531,325 576,527
Interest rate swaps - assets 531,325 576,527
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member]    
Interest rate caps 2,034,898 2,338,281
Interest rate swaps - assets 2,034,898 2,338,281
Interest rate swaps - liabilities 2,034,898 2,338,281
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest-bearing Deposits [Member]    
Interest-bearing deposits at financial institutions 157,420,706 63,948,925
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans/leases receivable, net 11,649,983 11,873,260
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans/leases receivable, net $ 12,581,982 $ 12,823,121