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Note 6 - Fair Value - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Interest-bearing deposits at financial institutions $ 40,801,388 $ 55,765,012
Securities held to maturity, fair value 397,252,368 379,749,804
Securities available for sale, fair value 257,944,671 272,907,907
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and due from banks 69,069,403 75,721,663
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and due from banks 69,069,403 75,721,663
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Federal funds sold 10,866,000 30,197,000
Securities held to maturity, fair value 400,052,344 379,474,205
Securities available for sale, fair value 257,944,671 272,907,907
Loans/leases receivable, net 3,072,919,367 2,921,821,953
Short-term borrowings 17,585,605 13,993,122
FHLB advances 254,100,000 192,000,000
Other borrowings 71,125,000 66,000,000
Junior subordinated debentures 37,580,881 37,486,487
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Non-maturity Deposits [Member]    
Deposits 2,622,243,626 2,670,583,178
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Time Deposits [Member]    
Deposits 676,032,401 596,071,878
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest rate cap    
Interest rate 706,291 506,700
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest rate swap    
Interest rate 6,171,740 4,397,238
Interest rate swaps - liabilities 6,543,790 4,397,238
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest-bearing Deposits [Member]    
Interest-bearing deposits at financial institutions 40,801,388 55,765,012
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Federal funds sold 10,866,000 30,197,000
Securities held to maturity, fair value 397,252,368 379,749,804
Securities available for sale, fair value 257,944,671 272,907,907
Loans/leases receivable, net 3,020,805,000 2,892,963,000
Short-term borrowings 17,585,605 13,993,122
FHLB advances 254,008,000 192,115,000
Other borrowings 71,645,000 66,520,000
Junior subordinated debentures 29,851,237 29,253,624
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Non-maturity Deposits [Member]    
Deposits 2,622,243,626 2,670,583,178
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Time Deposits [Member]    
Deposits 677,799,000 591,772,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest rate cap    
Interest rate 706,291 506,700
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest rate swap    
Interest rate 6,171,740 4,397,238
Interest rate swaps - liabilities 6,543,790 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 40,801,388 55,765,012
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans/leases receivable, net 4,327,980 8,307,719
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans/leases receivable, net $ 4,674,218 $ 8,972,337