Note 9 - Disclosures About Fair Value of Assets and Liabilities - Fair Value Quantitative Information (Details) - Fair Value, Inputs, Level 3 [Member] - Market Approach Valuation Technique [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Impaired Loans [Member]
Assets, fair value	$ 1,053
Valuation technique	Market Comparable
Unobservable input	Discount to reflect realizable value
Impaired Loans [Member] | Minimum [Member]
Range	0.00%
Impaired Loans [Member] | Maximum [Member]
Range	71.00%
Impaired Loans [Member] | Weighted Average [Member]
Range	10.00%
Foreclosed Assets Held For Sale [Member]
Range	0.00%
Assets, fair value
Valuation technique	Market Comparable
Unobservable input	Discount to reflect realizable value