Note 4 - Allowance for Loan Losses (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Note 4 - Allowance for Loan Losses (Details) [Line Items]
Loan Balance for Reviewing High Risk Loans Minimum	$ 250,000
Loans and Leases Receivable, Gross	760,078,000	$ 746,094,000	$ 735,763,000
Loans and Leases Receivable, Allowance	8,480,000	8,802,000	10,470,000	$ 11,806,000
Impaired Financing Receivable Recorded Investment Below Review Threshold	4,300,000		3,930,000
Substandard [Member]
Note 4 - Allowance for Loan Losses (Details) [Line Items]
Loans and Leases Receivable, Gross	27,619,000	$ 32,883,000
Loans Not Classified as Impaired [Member] | Substandard [Member]
Note 4 - Allowance for Loan Losses (Details) [Line Items]
Loans and Leases Receivable, Gross	8,600,000		9,000,000
Loans and Leases Receivable, Allowance	$ 569,000		$ 630,000