Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	$ 11,698	$ 14,009
Commercial Portfolio Segment [Member]
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	2,563	1,994
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	1,197	5,488
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	1,190	1,071
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	3,705	3,649
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	1,742	1,775
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	1,270
Consumer Portfolio Segment [Member]
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]
Nonaccrual loans	$ 31	$ 32