Note 6 - Fair Value (Detail) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (USD $)	Sep. 30, 2012	Dec. 31, 2011
Cash and due from banks	$ 40,564,561	$ 53,136,710
Cash and due from banks	40,564,561	53,136,710
Federal funds sold	5,725,000	20,785,000
Federal funds sold	5,725,000	20,785,000
Interest-bearing deposits at financial institutions	49,436,938	26,750,602
Interest-bearing deposits at financial institutions	40,564,561	53,136,710
Investment securities:
Held to maturity	650,000	200,000
Held to maturity	650,000	200,000
Available for sale	590,701,449	565,029,291
Available for sale	590,701,449	565,029,291
Loans/leases receivable, net	1,224,875,461	1,181,956,235
Loans/leases receivable, net	1,243,192,000	1,202,817,000
Accrued interest receivable	6,640,822	6,510,021
Accrued interest receivable	6,640,822	6,510,021
Deposits	1,343,235,434	1,205,457,788
Deposits	1,346,256,000	1,209,197,000
Short-term borrowings	140,888,698	213,536,450
Short-term borrowings	140,888,698	213,536,450
Federal Home Loan Bank advances	196,350,000	204,750,000
Federal Home Loan Bank advances	216,052,000	223,678,000
Other borrowings	138,237,737	136,231,663
Other borrowings	154,663,000	151,813,000
Junior subordinated debentures	36,085,000	36,085,000
Junior subordinated debentures	18,753,000	18,444,000
Accrued interest payable	1,373,671	1,551,842
Accrued interest payable	1,373,671	1,551,842
Interest-bearing Deposits [Member]
Cash and due from banks	49,436,938	26,750,602
Interest-bearing deposits at financial institutions	49,436,938	26,750,602
Interest-bearing deposits at financial institutions	$ 49,436,938	$ 26,750,602