Note 12 - Fair Value Measurements (Details) - The Carrying Amounts and Estimated Fair Values of Financial Instruments - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents, carrying amount	$ 107,855	$ 100,914	$ 70,843	$ 68,253
Held to maturity investment securities, carrying amount	3,689	3,728
Held to maturity investment securities, fair value	3,893	3,923
Loans, net, carrying amount	923,868	917,975
Liabilities
Deposits, carrying amount	1,356,468	1,387,161
Federal funds purchased and other short-term borrowings, carrying amount	34,757	28,590
Securities sold under agreements to repurchase and other long-term borrowings, carrying amount	120,115	119,724
Subordinated notes payable to unconsolidated trusts	48,970	48,970
Reported Value Measurement [Member]
Assets
Cash and cash equivalents, carrying amount	107,855	100,914
Held to maturity investment securities, carrying amount	3,689	3,728
Loans, net, carrying amount	923,868	917,975
Accrued interest receivable, carrying amount	5,246	5,625
Federal Home Loan Bank and Federal Reserve Bank Stock, carrying amount	9,368	9,368
Liabilities
Deposits, carrying amount	1,356,468	1,387,161
Federal funds purchased and other short-term borrowings, carrying amount	34,757	28,590
Securities sold under agreements to repurchase and other long-term borrowings, carrying amount	120,115	119,724
Subordinated notes payable to unconsolidated trusts	48,970	48,970
Accrued interest payable, carrying amount	859	944
Estimate of Fair Value Measurement [Member]
Assets
Cash and cash equivalents, fair value	107,855	100,914
Held to maturity investment securities, fair value	3,893	3,923
Loans, net, fair value	922,241	918,697
Accrued interest receivable, fair value	5,246	5,625
Federal Home Loan Bank and Federal Reserve Bank Stock, fair value	0	0
Liabilities
Deposits, fair value	1,357,045	1,388,614
Federal funds purchased and other short-term borrowings, fair value	34,757	28,590
Securities sold under agreements to repurchase and other long-term borrowings, fair value	128,505	129,244
Subordinated notes payable to unconsolidated trusts, fair value	29,203	22,594
Accrued interest payable, fair value	859	944
Fair Value, Inputs, Level 1 [Member]
Assets
Cash and cash equivalents, fair value	107,855	100,914
Held to maturity investment securities, fair value	0	0
Loans, net, fair value	0	0
Accrued interest receivable, fair value	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock, fair value	0	0
Liabilities
Deposits, fair value	1,016,440	991,630
Federal funds purchased and other short-term borrowings, fair value	0	0
Securities sold under agreements to repurchase and other long-term borrowings, fair value	0	0
Subordinated notes payable to unconsolidated trusts, fair value	0	0
Accrued interest payable, fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Assets
Cash and cash equivalents, fair value	0	0
Held to maturity investment securities, fair value	3,893	3,923
Loans, net, fair value	0	0
Accrued interest receivable, fair value	5,246	5,625
Federal Home Loan Bank and Federal Reserve Bank Stock, fair value	0	0
Liabilities
Deposits, fair value	0	0
Federal funds purchased and other short-term borrowings, fair value	34,757	28,590
Securities sold under agreements to repurchase and other long-term borrowings, fair value	128,505	129,244
Subordinated notes payable to unconsolidated trusts, fair value	0	0
Accrued interest payable, fair value	859	944
Fair Value, Inputs, Level 3 [Member]
Assets
Cash and cash equivalents, fair value	0	0
Held to maturity investment securities, fair value	0	0
Loans, net, fair value	922,241	918,697
Accrued interest receivable, fair value	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock, fair value	0	0
Liabilities
Deposits, fair value	340,605	396,984
Federal funds purchased and other short-term borrowings, fair value	0	0
Securities sold under agreements to repurchase and other long-term borrowings, fair value	0	0
Subordinated notes payable to unconsolidated trusts, fair value	29,203	22,594
Accrued interest payable, fair value	$ 0	$ 0