Note 8 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (USD $)	Jun. 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	$ 44,316,890	$ 61,568,446
Federal funds sold	16,666,000	26,560,000
Interest-bearing deposits at financial institutions	34,573,775	22,359,490
Investment securities:
Held to maturity	105,201,749
Held to maturity	99,500,594	73,005,706
Available for sale	598,265,400	530,159,986
Loans/leases receivable, net	1,194,422,230	988,223,491
Deposits:
Deposits	1,716,779,910	1,374,114,100
Other borrowings	142,644,062	138,239,762
Nonmaturity Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Deposits:
Deposits	1,204,708,666	1,039,572,326
Deposits, fair value	1,204,708,666	1,039,572,326
Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Deposits:
Deposits	512,071,244	334,541,774
Deposits, fair value	517,791,000	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	44,316,890	61,568,446
Cash and due from banks	44,316,890	61,568,446
Interest-bearing deposits at financial institutions	44,316,890	61,568,446
Investment securities:
Available for sale	264,869	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	16,666,000	26,560,000
Federal funds sold	16,666,000	26,560,000
Investment securities:
Available for sale	598,000,531	529,925,533
Loans/leases receivable, net	1,494,749,541	1,250,745,552
Loans/leases receivable, net, fair value	1,496,225,203	1,262,090,766
Deposits:
Short-term borrowings	157,186,204	171,082,961
Short-term borrowings	157,186,204	171,082,961
Federal Home Loan Bank advances	209,949,500	202,350,000
Federal Home Loan Bank advances	221,501,000	220,815,000
Other borrowings	142,644,062	138,239,762
Other borrowings	154,228,000	154,101,000
Junior subordinated debentures	40,210,175	36,085,000
Junior subordinated debentures	27,856,246	18,786,000
Fair Value, Inputs, Level 3 [Member]
Investment securities:
Held to maturity	105,201,749	72,079,385
Held to maturity	99,500,594	73,005,706
Available for sale	0	0
Loans/leases receivable, net	14,820,182	16,716,883
Loans/leases receivable, net, fair value	16,005,797	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	34,573,775	22,359,490
Interest-bearing deposits at financial institutions	34,573,775	22,359,490
Interest-bearing deposits at financial institutions	$ 34,573,775	$ 22,359,490