Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	$ 16,907	$ 21,649
Commercial Portfolio Segment [Member]
Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	3,170	5,112
Commercial Real Estate Portfolio Segment [Member] | Other Loan [Member]
Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	7,611	9,696
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	6,068	6,782
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	24	24
Consumer Portfolio Segment [Member]
Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	$ 34	$ 35