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Note 7 - Fair Value - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Interest-bearing deposits at financial institutions $ 96,590,367 $ 55,765,012
Securities held to maturity, fair value 388,541,280 379,749,804
Securities available for sale, fair value 255,323,442 272,907,907
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and due from banks 73,406,657 75,721,663
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and due from banks 73,406,657 75,721,663
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Federal funds sold 33,070,000 30,197,000
Securities held to maturity, fair value 395,421,195 379,474,205
Securities available for sale, fair value 255,323,442 272,907,907
Loans/leases receivable, net 3,597,901,436 2,921,821,953
Short-term borrowings 12,929,499 13,993,122
FHLB advances 359,128,925 192,000,000
Other borrowings 73,950,426 66,000,000
Junior subordinated debentures 37,626,070 37,486,487
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Non-maturity Deposits [Member]    
Deposits 2,917,002,466 2,670,583,178
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Time Deposits [Member]    
Deposits 871,274,455 596,071,878
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest rate cap    
Interest rate 703,467 506,700
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest rate swap    
Interest rate 7,045,220 4,397,238
Interest rate swaps - liabilities 6,837,887 4,397,238
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest-bearing Deposits [Member]    
Interest-bearing deposits at financial institutions 96,590,367 55,765,012
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Federal funds sold 33,070,000 30,197,000
Securities held to maturity, fair value 392,621,219 379,749,804
Securities available for sale, fair value 255,323,442 272,907,907
Loans/leases receivable, net 3,527,043,000 2,892,963,000
Short-term borrowings 12,929,499 13,993,122
FHLB advances 358,357,000 192,115,000
Other borrowings 74,600,000 66,520,000
Junior subordinated debentures 29,946,263 29,253,624
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Non-maturity Deposits [Member]    
Deposits 2,917,002,466 2,670,583,178
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Time Deposits [Member]    
Deposits 863,227,000 591,772,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest rate cap    
Interest rate 703,467 506,700
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest rate swap    
Interest rate 7,045,220 4,397,238
Interest rate swaps - liabilities 6,837,887 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 96,590,367 55,765,012
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans/leases receivable, net 12,407,474 8,307,719
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans/leases receivable, net $ 13,400,072 $ 8,972,337