Note 12 - Fair Value Measurements (Details) - The Carrying Amounts and Estimated Fair Values of Financial Instruments - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents, carrying amount	$ 114,288	$ 120,493	$ 118,848	$ 100,914
Held to maturity investment securities, carrying amount	3,598	3,611
Held to maturity investment securities, fair value	3,826	3,809
Loans, net, carrying amount	952,461	948,960
Liabilities
Deposits, carrying amount	1,374,459	1,368,994
Federal funds purchased and other short-term borrowings, carrying amount	34,487	34,353
Securities sold under agreements to repurchase and other long-term borrowings, carrying amount	120,044	120,280
Subordinated notes payable to unconsolidated trusts	33,506	48,970
Fair Value, Inputs, Level 1 [Member]
Assets
Cash and cash equivalents, fair value	114,288	120,493
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	1,063,722	1,043,616
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	3,826	3,809
Loans, net, fair value	0	0
Accrued interest receivable, fair value	5,111	5,392
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	34,487	34,353
Securities sold under agreements to repurchase and other long-term borrowings, fair value	126,507	126,964
Subordinated notes payable to unconsolidated trusts, fair value	0	0
Accrued interest payable, fair value	845	851
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	946,067	945,809
Accrued interest receivable, fair value	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock, fair value	0	0
Liabilities
Deposits, fair value	310,768	325,400
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	19,539	31,515
Accrued interest payable, fair value	0	0
Reported Value Measurement [Member]
Assets
Cash and cash equivalents, carrying amount	114,288	120,493
Held to maturity investment securities, carrying amount	3,598	3,611
Loans, net, carrying amount	952,461	948,960
Accrued interest receivable, carrying amount	5,111	5,392
Federal Home Loan Bank and Federal Reserve Bank Stock, carrying amount	9,840	9,368
Liabilities
Deposits, carrying amount	1,374,459	1,368,994
Federal funds purchased and other short-term borrowings, carrying amount	34,487	34,353
Securities sold under agreements to repurchase and other long-term borrowings, carrying amount	120,044	120,280
Subordinated notes payable to unconsolidated trusts	33,506	48,970
Accrued interest payable, carrying amount	845	851
Estimate of Fair Value Measurement [Member]
Assets
Cash and cash equivalents, fair value	114,288	120,493
Held to maturity investment securities, fair value	3,826	3,809
Loans, net, fair value	946,067	945,809
Accrued interest receivable, fair value	5,111	5,392
Federal Home Loan Bank and Federal Reserve Bank Stock, fair value	0	0
Liabilities
Deposits, fair value	1,374,490	1,369,016
Federal funds purchased and other short-term borrowings, fair value	34,487	34,353
Securities sold under agreements to repurchase and other long-term borrowings, fair value	126,507	126,964
Subordinated notes payable to unconsolidated trusts, fair value	19,539	31,515
Accrued interest payable, fair value	$ 845	$ 851