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Note 5 - Fair Value - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
$ 322,989,377 $ 320,414,899
Securities available for sale, fair value 269,281,713 251,113,139
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and due from banks 77,161,353 70,569,993
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and due from banks 77,161,353 70,569,993
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Federal funds sold 19,183,000 22,257,000
324,203,634 322,909,056
Securities available for sale, fair value 269,281,713 251,113,139
Loans/leases receivable, net 2,509,319,274 2,362,856,277
Short-term borrowings 18,217,393 39,971,387
FHLB advances 106,500,000 137,500,000
Other borrowings 72,000,000 80,000,000
Junior subordinated debentures 33,546,425 33,480,202
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Non-maturity Deposits [Member]    
Deposits 2,311,779,642 2,188,683,349
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Time Deposits [Member]    
Deposits 558,454,597 480,577,924
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest Rate Cap [Member]    
Interest rate caps 398,973 576,527
Interest rate swaps - assets 398,973 576,527
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]    
Interest rate caps 2,547,466 2,338,281
Interest rate swaps - assets 2,547,466 2,338,281
Interest rate swaps - liabilities 2,547,466 2,338,281
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest-bearing Deposits [Member]    
Interest-bearing deposits at financial institutions 53,171,325 63,948,925
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Federal funds sold 19,183,000 22,257,000
322,989,377 320,414,899
Securities available for sale, fair value 269,281,713 251,113,139
Loans/leases receivable, net 2,491,370,000 2,344,462,740
Short-term borrowings 18,217,393 39,971,387
FHLB advances 107,071,000 138,338,000
Other borrowings 73,041,000 81,282,000
Junior subordinated debentures 25,169,023 24,881,494
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Non-maturity Deposits [Member]    
Deposits 2,311,779,642 2,188,683,349
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Time Deposits [Member]    
Deposits 557,833,000 479,605,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Cap [Member]    
Interest rate caps 398,973 576,527
Interest rate swaps - assets 398,973 576,527
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member]    
Interest rate caps 2,547,466 2,338,281
Interest rate swaps - assets 2,547,466 2,338,281
Interest rate swaps - liabilities 2,547,466 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 53,171,325 63,948,925
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans/leases receivable, net 10,889,702 11,873,260
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans/leases receivable, net $ 11,760,878 $ 12,823,121