Note 3 - Loans and Allowance for Loan Losses - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Nonaccrual loans	$ 455	$ 618
Residential Portfolio Segment [Member]
Nonaccrual loans	455	614
Commercial Real Estate Portfolio Segment [Member]
Nonaccrual loans		4
Construction and Land Real Estate [Member]
Nonaccrual loans
Commercial Portfolio Segment [Member]
Nonaccrual loans
Consumer Portfolio Segment [Member]
Nonaccrual loans