Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Troubled Debt Restructurings by Class (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Commercial Real Estate
Number of Contracts	1	2
Pre-Modification Outstanding Principal Balance	$ 184	$ 3,654
Post-Modification Outstanding Principal Balance	209	3,739
Commercial Real Estate Loans [Member] | Commercial real estate, owner occupied [Member]
Commercial Real Estate
Number of Contracts	1
Pre-Modification Outstanding Principal Balance	184
Post-Modification Outstanding Principal Balance	209
Real Estate Construction [Member] | Construction other [Member]
Commercial Real Estate
Number of Contracts		1
Pre-Modification Outstanding Principal Balance		3,500
Post-Modification Outstanding Principal Balance		3,500
Commercial Non Real Estate [Member] | Commercial and Industrial [Member]
Commercial Real Estate
Number of Contracts		1
Pre-Modification Outstanding Principal Balance		154
Post-Modification Outstanding Principal Balance		$ 239