Note 19 - Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Held to Maturity Securities - Estimated Fair Value	$ 3,597	$ 3,809
Reported Value Measurement [Member]
Cash and cash equivalents	113,534	120,493
Held to Maturity Securities - Estimated Fair Value	3,488	3,611
Loans, net	961,631	948,960
Accrued interest receivable	5,019	5,392
Federal Home Loan Bank and Federal Reserve Bank Stock	9,840	9,368
Deposits	1,369,907	1,368,994
Federal funds purchased and short-term securities sold under agreements to repurchase	35,085	34,353
Securities sold under agreements to repurchase and other long-term borrowings	19,931	120,280
Subordinated notes payable to unconsolidated trusts	33,506	48,970
Accrued interest payable	321	851
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	113,534	120,493
Held to Maturity Securities - Estimated Fair Value	3,597	3,809
Loans, net	962,437	945,809
Accrued interest receivable	5,019	5,392
Federal Home Loan Bank and Federal Reserve Bank Stock	0	0
Deposits	1,369,567	1,369,016
Federal funds purchased and short-term securities sold under agreements to repurchase	35,085	34,353
Securities sold under agreements to repurchase and other long-term borrowings	20,410	126,964
Subordinated notes payable to unconsolidated trusts	21,234	31,515
Accrued interest payable	321	851
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	113,534	120,493
Held to Maturity Securities - Estimated Fair Value	0	0
Loans, net	0	0
Accrued interest receivable	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock	0	0
Deposits	1,099,211	1,043,616
Federal funds purchased and short-term securities sold under agreements to repurchase	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
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Held to Maturity Securities - Estimated Fair Value	3,597	3,809
Loans, net	0	0
Accrued interest receivable	5,019	5,392
Federal Home Loan Bank and Federal Reserve Bank Stock	0	0
Deposits	0	0
Federal funds purchased and short-term securities sold under agreements to repurchase	35,085	34,353
Securities sold under agreements to repurchase and other long-term borrowings	20,410	126,964
Subordinated notes payable to unconsolidated trusts	0	0
Accrued interest payable	321	851
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Held to Maturity Securities - Estimated Fair Value	0	0
Loans, net	962,437	945,809
Accrued interest receivable	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock	0	0
Deposits	270,356	325,400
Federal funds purchased and short-term securities sold under agreements to repurchase	0
Securities sold under agreements to repurchase and other long-term borrowings	0	0
Subordinated notes payable to unconsolidated trusts	21,234	31,515
Accrued interest payable	$ 0	$ 0