Note 8 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (USD $)	Sep. 30, 2013	Dec. 31, 2012
Note 8 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]
Cash and due from banks	$ 58,724,270	$ 61,568,446
Federal funds sold	48,192,000	26,560,000
Interest-bearing deposits at financial institutions	15,862,796	22,359,490
Investment securities:
Held to maturity	131,361,845
Held to maturity	125,292,362	73,005,706
Available for sale	572,337,329	530,159,986
Loans/leases receivable, net	1,185,958,027	988,223,491
Deposits:
Deposits	1,741,831,975	1,374,114,100
Other borrowings	142,646,212	138,239,762
Nonmaturity Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Deposits:
Deposits	1,295,910,195	1,039,572,326
Deposits, fair value	1,295,910,195	1,039,572,326
Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Deposits:
Deposits	445,921,780	334,541,774
Deposits, fair value	447,290,000	337,343,000
Fair Value, Inputs, Level 1 [Member]
Note 8 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]
Cash and due from banks	58,724,270	61,568,446
Cash and due from banks	58,724,270	61,568,446
Interest-bearing deposits at financial institutions	58,724,270	61,568,446
Investment securities:
Available for sale	285,214	234,453
Fair Value, Inputs, Level 2 [Member]
Note 8 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]
Federal funds sold	48,192,000	26,560,000
Federal funds sold	48,192,000	26,560,000
Investment securities:
Available for sale	572,052,115	529,925,533
Loans/leases receivable, net	1,506,914,312	1,250,745,552
Loans/leases receivable, net, fair value	1,521,560,306	1,262,090,766
Deposits:
Short-term borrowings	169,259,562	171,082,961
Short-term borrowings	169,259,562	171,082,961
Federal Home Loan Bank advances	205,350,000	202,350,000
Federal Home Loan Bank advances	216,440,000	220,815,000
Other borrowings	142,646,212	138,239,762
Other borrowings	154,164,000	154,101,000
Junior subordinated debentures	40,257,438	36,085,000
Junior subordinated debentures	27,903,509	18,786,000
Fair Value, Inputs, Level 3 [Member]
Investment securities:
Held to maturity	131,361,845	72,079,385
Held to maturity	125,292,362	73,005,706
Available for sale	0	0
Loans/leases receivable, net	10,407,124	16,716,883
Loans/leases receivable, net, fair value	11,239,694	18,054,234
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Note 8 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]
Cash and due from banks	15,862,796	22,359,490
Interest-bearing deposits at financial institutions	15,862,796	22,359,490
Interest-bearing deposits at financial institutions	$ 15,862,796	$ 22,359,490