Note 4 - Loans and Allowance for Loan Losses (Details) - TDR Loan Modifications (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	$ 11,214	$ 16,954
Interest Only Payments [Member] | Performing to Modified Terms [Member] | Residential Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	249	0
Interest Only Payments [Member] | Performing to Modified Terms [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	0	0
Interest Only Payments [Member] | Performing to Modified Terms [Member] | Commercial Real Estate Nonowner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	8,652	9,856
Interest Only Payments [Member] | Not Performing to Modified Terms [Member] | Residential Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	0	180
Interest Only Payments [Member] | Not Performing to Modified Terms [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	579	675
Interest Only Payments [Member] | Not Performing to Modified Terms [Member] | Commercial Real Estate Nonowner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	0	300
Interest Only Payments [Member] | Residential Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	249	180
Interest Only Payments [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	579	675
Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	8,652	10,156
Rate Reduction [Member] | Performing to Modified Terms [Member] | Residential Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	0	420
Rate Reduction [Member] | Performing to Modified Terms [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	0	440
Rate Reduction [Member] | Not Performing to Modified Terms [Member] | Residential Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	426	0
Rate Reduction [Member] | Not Performing to Modified Terms [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	261	0
Rate Reduction [Member] | Residential Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	426	420
Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	261	440
Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Performing to Modified Terms [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	174	191
Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Performing to Modified Terms [Member] | Home Equity Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	218
Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Not Performing to Modified Terms [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	0	0
Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Not Performing to Modified Terms [Member] | Home Equity Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	0
Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	174	191
Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Home Equity Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	218
Commercial Real Estate Nonowner Occupied [Member] | Performing to Modified Terms [Member] | Reduction of Principal and Interest Payments [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	655
Commercial Real Estate Nonowner Occupied [Member] | Not Performing to Modified Terms [Member] | Reduction of Principal and Interest Payments [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	0
Commercial Real Estate Nonowner Occupied [Member] | Reduction of Principal and Interest Payments [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	655
Reduction of Principal and Interest Payments [Member] | Performing to Modified Terms [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		4,222
Reduction of Principal and Interest Payments [Member] | Performing to Modified Terms [Member] | Commercial Real Estate Nonowner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		670
Reduction of Principal and Interest Payments [Member] | Not Performing to Modified Terms [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		0
Reduction of Principal and Interest Payments [Member] | Not Performing to Modified Terms [Member] | Commercial Real Estate Nonowner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		0
Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		4,222
Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		670
Performing to Modified Terms [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	9,948	15,799
Not Performing to Modified Terms [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	$ 1,266	$ 1,155