Note 4 - Allowance for Loan Losses (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014	Sep. 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	764,204,000	$ 746,094,000	$ 743,281,000
Loans and Leases Receivable, Allowance	8,402,000	8,802,000	9,788,000	$ 11,806,000
Impaired Financing Receivable Recorded Investment Below Review Threshold	3,900,000		4,410,000
Substandard [Member]
Note 4 - Allowance for Loan Losses (Details) [Line Items]
Loans and Leases Receivable, Gross	32,023,000	$ 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	14,030,000		12,700,000
Loans and Leases Receivable, Allowance	$ 1,300,000		$ 1,100,000