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Note 21 - Fair Value - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Securities held to maturity, fair value $ 379,749,804 $ 320,414,899
Securities available for sale, fair value 272,907,907 251,113,139
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and due from banks 75,721,663 70,569,993
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and due from banks 75,721,663 70,569,993
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Federal funds sold 30,197,000 22,257,000
Securities held to maturity, fair value 379,474,205 322,909,056
Securities available for sale, fair value 272,907,907 251,113,139
Loans/leases receivable, net 2,921,821,953 2,362,856,277
Short-term borrowings 13,993,122 39,971,387
FHLB advances 192,000,000 137,500,000
Other borrowings 66,000,000 80,000,000
Junior subordinated debentures 37,486,487 33,480,202
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Non-maturity Deposits [Member]    
Deposits 2,670,583,178 2,188,683,349
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Time Deposits [Member]    
Deposits 596,071,878 480,577,924
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest Rate Cap [Member]    
Interest rate caps 506,700 576,527
Interest rate swaps - assets 506,700 576,527
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]    
Interest rate caps 4,397,238 2,338,281
Interest rate swaps - assets 4,397,238 2,338,281
Interest rate swaps - liabilities 4,397,238 2,338,281
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest-bearing Deposits [Member]    
Interest-bearing deposits at financial institutions 55,765,012 63,948,925
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Federal funds sold 30,197,000 22,257,000
Securities held to maturity, fair value 379,749,804 320,414,899
Securities available for sale, fair value 272,907,907 251,113,139
Loans/leases receivable, net 2,892,963,000 2,344,462,740
Short-term borrowings 13,993,122 39,971,387
FHLB advances 192,115,000 138,338,000
Other borrowings 66,520,000 81,282,000
Junior subordinated debentures 29,253,624 24,881,494
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Non-maturity Deposits [Member]    
Deposits 2,670,583,178 2,188,683,349
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Time Deposits [Member]    
Deposits 591,772,000 479,605,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Cap [Member]    
Interest rate caps 506,700 576,527
Interest rate swaps - assets 506,700 576,527
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member]    
Interest rate caps 4,397,238 2,338,281
Interest rate swaps - assets 4,397,238 2,338,281
Interest rate swaps - liabilities 4,397,238 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 55,765,012 63,948,925
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans/leases receivable, net 8,307,719 11,873,260
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans/leases receivable, net $ 8,972,337 $ 12,823,121