Note 5 - Disclosures About Fair Value of Assets and Liabilities - Assets Measured at Fair Value on a Non-Recurring Basis (Details) - Impaired Loans, Collateral-Dependent [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets, fair value, non-recurring basis		$ 232
Fair Value, Inputs, Level 1 [Member]
Assets, fair value, non-recurring basis
Fair Value, Inputs, Level 2 [Member]
Assets, fair value, non-recurring basis
Fair Value, Inputs, Level 3 [Member]
Assets, fair value, non-recurring basis		$ 232