Note 8 - Troubled Debt Restructurings (Details) - Performing TDR Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Performing TDR Loans	$ 3,700	$ 4,600
Percentage of total loans, net	0.90%	1.10%
Commercial Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Performing TDR Loans	1,118	1,132
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Performing TDR Loans	8	9
Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Performing TDR Loans	164	165
Consumer Lots and Raw Land [Member]
Financing Receivable, Modifications [Line Items]
Performing TDR Loans	58	60
Consumer Other [Member]
Financing Receivable, Modifications [Line Items]
Performing TDR Loans	8	56
Performing TDR Loans [Member]
Financing Receivable, Modifications [Line Items]
Performing TDR Loans	$ 1,356	$ 1,422
Percentage of total loans, net	0.30%	0.30%