Note 4 - Loans and Allowance for Loan Losses (Details) - TDR Loan Modifications (USD $)	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	$ 11,178,000	$ 16,954,000
Interest Only Payments [Member] \| Performing to Modified Terms [Member] \| Residential Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	249,000
Interest Only Payments [Member] \| Performing to Modified Terms [Member] \| Commercial Real Estate Nonowner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	8,825,000	9,856,000
Interest Only Payments [Member] \| Not Performing to Modified Terms [Member] \| Residential Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		180,000
Interest Only Payments [Member] \| Not Performing to Modified Terms [Member] \| Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	580,000
Interest Only Payments [Member] \| Not Performing to Modified Terms [Member] \| Commercial Real Estate Nonowner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		300,000
Interest Only Payments [Member] \| Not Performing to Modified Terms [Member] \| Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		675,000
Interest Only Payments [Member] \| Residential Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	249,000	180,000
Interest Only Payments [Member] \| Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	580,000
Interest Only Payments [Member] \| Commercial Real Estate Nonowner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	8,825,000	10,156,000
Interest Only Payments [Member] \| Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		675,000
Rate Reduction [Member] \| Performing to Modified Terms [Member] \| Residential Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		420,000
Rate Reduction [Member] \| Performing to Modified Terms [Member] \| Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		440,000
Rate Reduction [Member] \| Not Performing to Modified Terms [Member] \| Residential Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	426,000
Rate Reduction [Member] \| Not Performing to Modified Terms [Member] \| Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	262,000
Rate Reduction [Member] \| Residential Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	426,000	420,000
Rate Reduction [Member] \| Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	262,000	440,000
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	176,000	191,000
Maturity Extension at Lower Stated Rate Than Market Rate [Member] \| Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	176,000	191,000
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	660,000
Commercial Real Estate Nonowner Occupied [Member] \| Reduction of Principal and Interest Payments [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	660,000
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		4,222,000
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		670,000
Reduction of Principal and Interest Payments [Member] \| Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		4,222,000
Reduction of Principal and Interest Payments [Member] \| Commercial Real Estate Nonowner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings		670,000
Performing to Modified Terms [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	9,910,000	15,799,000
Not Performing to Modified Terms [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings	$ 1,268,000	$ 1,155,000