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Note 6 - Fair Value (Detail) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (USD $)
Mar. 31, 2013
Mar. 13, 2013
Dec. 31, 2012
Cash and due from banks $ 33,254,137   $ 61,568,446
Federal funds sold     26,560,000
Interest-bearing deposits at financial institutions 33,781,655   22,359,490
Investment securities:      
Available for sale 605,545,374 605,545,374 530,159,986
Available for sale 605,545,374   530,159,986
Loans/leases receivable, net 996,755,858   988,223,491
Deposits:      
Deposits 1,420,493,258   1,374,114,100
Other borrowings 138,241,912   138,239,762
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
     
Cash and due from banks 33,781,655   22,359,490
Interest-bearing deposits at financial institutions 33,781,655   22,359,490
Interest-bearing deposits at financial institutions 33,781,655   22,359,490
Nonmaturity Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
     
Deposits:      
Deposits 1,083,387,164   1,039,572,326
Deposits, fair value 1,083,387,164   1,039,572,326
Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
     
Deposits:      
Deposits 337,106,094   334,541,774
Deposits, fair value 339,550,000   337,343,000
Fair Value, Inputs, Level 1 [Member]
     
Cash and due from banks 33,254,137   61,568,446
Cash and due from banks 33,254,137   61,568,446
Interest-bearing deposits at financial institutions 33,254,137   61,568,446
Investment securities:      
Available for sale 255,370   234,453
Fair Value, Inputs, Level 2 [Member]
     
Federal funds sold     26,560,000
Federal funds sold     26,560,000
Investment securities:      
Available for sale 605,290,004   529,925,533
Loans/leases receivable, net 1,259,387,332   1,250,745,552
Loans/leases receivable, net, fair value 1,269,628,186   1,262,090,766
Deposits:      
Short-term borrowings 171,853,471   171,082,961
Short-term borrowings 171,853,471   171,082,961
Federal Home Loan Bank advances 205,350,000   202,350,000
Federal Home Loan Bank advances 222,673,000   220,815,000
Other borrowings 138,241,912   138,239,762
Other borrowings 149,671,000   154,101,000
Junior subordinated debentures 36,085,000   36,085,000
Junior subordinated debentures 18,862,000   18,786,000
Fair Value, Inputs, Level 3 [Member]
     
Investment securities:      
Held to maturity 87,006,209   72,079,385
Held to maturity 87,345,034   73,005,706
Available for sale 0   0
Loans/leases receivable, net 11,638,717   16,716,883
Loans/leases receivable, net, fair value $ 12,569,814   $ 18,054,234