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Note 19 - Fair Value (Detail) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (USD $)
Dec. 31, 2012
Dec. 31, 2011
Cash and due from banks $ 61,568,446 $ 53,136,710
Federal funds sold 26,560,000 20,785,000
Interest-bearing deposits at financial institutions 22,359,490 26,750,602
Investment securities:    
Available for sale 530,159,986 565,029,291
Available for sale 530,159,986 565,029,291
Loans/leases receivable, net 988,223,491 928,598,128
Deposits:    
Deposits 1,374,114,100 1,205,457,788
Federal Home Loan Bank advances 202,350,000 204,750,000
Other borrowings 138,239,762 136,231,663
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
   
Cash and due from banks 22,359,490 26,750,602
Interest-bearing deposits at financial institutions 22,359,490 26,750,602
Interest-bearing deposits at financial institutions 22,359,490 26,750,602
Nonmaturity Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
   
Deposits:    
Deposits 1,039,572,326 867,972,148
Deposits, fair value 1,039,572,326 867,972,148
Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
   
Deposits:    
Deposits 334,541,774 337,485,640
Deposits, fair value 337,343,000 341,224,852
Fair Value, Inputs, Level 1 [Member]
   
Cash and due from banks 61,568,446 53,136,710
Cash and due from banks 61,568,446 53,136,710
Interest-bearing deposits at financial institutions 61,568,446 53,136,710
Investment securities:    
Available for sale 234,453 191,506
Fair Value, Inputs, Level 2 [Member]
   
Federal funds sold 26,560,000 20,785,000
Federal funds sold 26,560,000 20,785,000
Investment securities:    
Available for sale 529,925,533 564,837,785
Loans/leases receivable, net 1,250,745,552 1,163,804,976
Loans/leases receivable, net, fair value 1,262,090,766 1,183,213,640
Deposits:    
Short-term borrowings 171,082,961 213,536,450
Short-term borrowings 171,082,961 213,536,450
Federal Home Loan Bank advances 202,350,000 204,750,000
Federal Home Loan Bank advances 220,815,000 223,678,000
Other borrowings 138,239,762 136,231,663
Other borrowings 154,101,000 151,813,000
Junior subordinated debentures 36,085,000 36,085,000
Junior subordinated debentures 18,786,000 18,444,000
Fair Value, Inputs, Level 3 [Member]
   
Investment securities:    
Held to maturity 72,079,385 200,000
Held to maturity 73,005,706 200,000
Available for sale 0 0
Loans/leases receivable, net 16,716,883 18,151,259
Loans/leases receivable, net, fair value $ 18,054,234 $ 19,603,360