Note 5 - Disclosures About Fair Value of Assets and Liabilities - Quantitative Information About Unobservable Inputs (Details) - Impaired Loans, Collateral-Dependent [Member] - Market Approach Valuation Technique [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Fair value		$ 232
Valuation technique	Marketable comparable properties	Marketable comparable properties
Unobservable input	Marketability discount	Marketability discount
Minimum [Member]
Marketability discount		10.00%
Maximum [Member]
Marketability discount		15.00%