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Note 21 - Fair Value - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Interest-bearing deposits at financial institutions $ 133,198,095 $ 55,765,012
Securities held to maturity, fair value 400,770,583 379,749,804
Securities available for sale, fair value 261,056,448 272,907,907
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and due from banks 85,522,685 75,721,663
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and due from banks 85,522,685 75,721,663
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Federal funds sold 26,398,000 30,197,000
Securities held to maturity, fair value 401,912,885 379,474,205
Securities available for sale, fair value 261,056,448 272,907,907
Loans/leases receivable, net 3,683,965,349 2,921,821,953
Short-term borrowings 28,774,157 13,993,122
FHLB advances 266,492,039 192,000,000
Other borrowings 72,032,318 66,000,000
Junior subordinated debentures 37,670,043 37,486,487
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Non-maturity Deposits [Member]    
Deposits 3,002,326,538 2,670,583,178
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Time Deposits [Member]    
Deposits 974,704,036 596,071,878
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest rate cap    
Interest rate 458,812 506,700
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest rate swap    
Interest rate 22,195,713 4,397,238
Interest rate swaps - liabilities 23,346,887 4,397,238
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest-bearing Deposits [Member]    
Interest-bearing deposits at financial institutions 133,198,095 55,765,012
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Federal funds sold 26,398,000 30,197,000
Securities held to maturity, fair value 400,770,583 379,749,804
Securities available for sale, fair value 261,056,448 272,907,907
Loans/leases receivable, net 3,639,329,000 2,892,963,000
Short-term borrowings 28,774,157 13,993,122
FHLB advances 265,926,000 192,115,000
Other borrowings 72,703,000 66,520,000
Junior subordinated debentures 29,992,198 29,253,624
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Non-maturity Deposits [Member]    
Deposits 3,002,326,538 2,670,583,178
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Time Deposits [Member]    
Deposits 968,906,000 591,772,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest rate cap    
Interest rate 458,812 506,700
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest rate swap    
Interest rate 22,195,713 4,397,238
Interest rate swaps - liabilities 23,346,887 4,397,238
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest-bearing Deposits [Member]    
Interest-bearing deposits at financial institutions 133,198,095 55,765,012
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans/leases receivable, net 8,941,585 8,307,719
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans/leases receivable, net $ 9,656,912 $ 8,972,337