Note 6 - Fair Value Measurements (Details) - The Carrying Amounts and Estimated Fair Values of the Company’s Financial Instruments (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 97,589	$ 95,855	$ 71,001	$ 94,309
Held to maturity investment securities	820	820
Held to maturity investment securities	910	956
Loans, net	981,823	980,550
Liabilities
Deposits	1,402,515	1,410,810
Federal funds purchased and other short-term borrowings	28,810	24,083
Securities sold under agreements to repurchase and other long-term borrowings	127,204	129,297
Subordinated notes payable to unconsolidated trusts	48,970	48,970
Fair Value, Inputs, Level 1 [Member]
Assets
Cash and cash equivalents	97,589	95,855
Held to maturity investment securities	0	0
Loans, net	0	0
Accrued interest receivable	0	0
Liabilities
Deposits	893,438	870,145
Federal funds purchased and other short-term borrowings	0	0
Securities sold under agreements to repurchase and other long-term borrowings	0	0
Subordinated notes payable to unconsolidated trusts	0	0
Accrued interest payable	0	0
Fair Value, Inputs, Level 2 [Member]
Assets
Cash and cash equivalents	0	0
Held to maturity investment securities	910	956
Loans, net	0	0
Accrued interest receivable	5,755	6,074
Liabilities
Deposits	0	0
Federal funds purchased and other short-term borrowings	28,810	24,083
Securities sold under agreements to repurchase and other long-term borrowings	141,631	148,680
Subordinated notes payable to unconsolidated trusts	0	0
Accrued interest payable	1,310	1,370
Fair Value, Inputs, Level 3 [Member]
Assets
Cash and cash equivalents	0	0
Held to maturity investment securities	0	0
Loans, net	981,038	979,301
Accrued interest receivable	0	0
Liabilities
Deposits	511,886	544,250
Federal funds purchased and other short-term borrowings	0	0
Securities sold under agreements to repurchase and other long-term borrowings	0	0
Subordinated notes payable to unconsolidated trusts	24,146	21,015
Accrued interest payable	0	0
Reported Value Measurement [Member]
Assets
Cash and cash equivalents	97,589	95,855
Held to maturity investment securities	820	820
Loans, net	981,823	980,550
Accrued interest receivable	5,755	6,074
Federal Home Loan Bank and Federal Reserve Bank Stock	9,516	9,516
Liabilities
Deposits	1,402,515	1,410,810
Federal funds purchased and other short-term borrowings	28,810	24,083
Securities sold under agreements to repurchase and other long-term borrowings	127,204	129,297
Subordinated notes payable to unconsolidated trusts	48,970	48,970
Accrued interest payable	1,310	1,370
Estimate of Fair Value Measurement [Member]
Assets
Cash and cash equivalents	97,589	95,855
Held to maturity investment securities	910	956
Loans, net	981,038	979,301
Accrued interest receivable	5,755	6,074
Liabilities
Deposits	1,405,324	1,414,395
Federal funds purchased and other short-term borrowings	28,810	24,083
Securities sold under agreements to repurchase and other long-term borrowings	141,631	148,680
Subordinated notes payable to unconsolidated trusts	24,146	21,015
Accrued interest payable	$ 1,310	$ 1,370