Note 4 - Loans and Allowance for Loan Losses (Details) - TDR Loan Modifications (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Residential real estate
Troubled Debt Restructuring	$ 12,371	$ 12,606
Residential Portfolio Segment [Member] | Interest Only Payments [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructuring	526	527
Residential Portfolio Segment [Member] | Interest Only Payments [Member]
Residential real estate
Troubled Debt Restructuring	526	527
Residential Portfolio Segment [Member] | Rate Reduction [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructuring	417	420
Residential Portfolio Segment [Member] | Rate Reduction [Member]
Residential real estate
Troubled Debt Restructuring	417	420
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Interest Only Payments [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructuring	8,380
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Interest Only Payments [Member]
Residential real estate
Troubled Debt Restructuring	8,380
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Rate Reduction [Member] | Nonperforming Financing Receivable [Member]
Residential real estate
Troubled Debt Restructuring	258	259
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Rate Reduction [Member]
Residential real estate
Troubled Debt Restructuring	258	259
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructuring	271	271
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Maturity Extension at Lower Stated Rate Than Market Rate [Member]
Residential real estate
Troubled Debt Restructuring	271	271
Commercial Real Estate Portfolio Segment [Member] | Nonowner Occupied [Member] | Interest Only Payments [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructuring	1,657	8,450
Commercial Real Estate Portfolio Segment [Member] | Nonowner Occupied [Member] | Interest Only Payments [Member]
Residential real estate
Troubled Debt Restructuring	1,657	8,450
Commercial Real Estate Portfolio Segment [Member] | Nonowner Occupied [Member] | Reduction of Principal and Interest Payments [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructuring	644	650
Commercial Real Estate Portfolio Segment [Member] | Nonowner Occupied [Member] | Reduction of Principal and Interest Payments [Member]
Residential real estate
Troubled Debt Restructuring	644	650
Consumer Portfolio Segment [Member] | Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Home Equity Line of Credit [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructuring	218	218
Consumer Portfolio Segment [Member] | Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Home Equity Line of Credit [Member]
Residential real estate
Troubled Debt Restructuring	218	218
Commercial and Industrial [Member] | Interest Only Payments [Member] | Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructuring		1,811
Commercial and Industrial [Member] | Interest Only Payments [Member]
Residential real estate
Troubled Debt Restructuring		1,811
Performing Financing Receivable [Member]
Residential real estate
Troubled Debt Restructuring	12,113	12,347
Nonperforming Financing Receivable [Member]
Residential real estate
Troubled Debt Restructuring	$ 258	$ 259