Note 4 - Loans and Allowance for Loan Losses (Details) - TDR Loan Modifications (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Interest Only Payments [Member] | Residential Portfolio Segment [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructurings	$ 523	$ 527
Interest Only Payments [Member] | Residential Portfolio Segment [Member]
Residential real estate
Troubled Debt Restructurings	523	527
Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructurings	8,263	8,450
Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]
Residential real estate
Troubled Debt Restructurings	8,263	8,450
Interest Only Payments [Member] | Commercial and Industrial [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructurings	5,217	1,811
Interest Only Payments [Member] | Commercial and Industrial [Member]
Residential real estate
Troubled Debt Restructurings	5,217	1,811
Rate Reduction [Member] | Residential Portfolio Segment [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructurings	411	420
Rate Reduction [Member] | Residential Portfolio Segment [Member]
Residential real estate
Troubled Debt Restructurings	411	420
Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member] | Nonperforming Financing Receivable [Member]
Residential real estate
Troubled Debt Restructurings	249	259
Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member]
Residential real estate
Troubled Debt Restructurings	249	259
Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Commercial Real Estate Owner Occupied [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructurings	1,062	271
Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Commercial Real Estate Owner Occupied [Member]
Residential real estate
Troubled Debt Restructurings	1,062	271
Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Home Equity Loans [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructurings	218	218
Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Home Equity Loans [Member]
Residential real estate
Troubled Debt Restructurings	218	218
Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Nonowner Occupied [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructurings	633	650
Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]
Residential real estate
Troubled Debt Restructurings	633	650
Credit Extension at Lower State Rate than Market Rate [Member] | Commercial and Industrial [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructurings	395
Credit Extension at Lower State Rate than Market Rate [Member] | Commercial and Industrial [Member]
Residential real estate
Troubled Debt Restructurings	395
Home Equity Loans [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructurings	16,722	12,347
Home Equity Loans [Member] | Nonperforming Financing Receivable [Member]
Residential real estate
Troubled Debt Restructurings	249	259
Home Equity Loans [Member]
Residential real estate
Troubled Debt Restructurings	$ 16,971	$ 12,606