Note 11 - Fair Values (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Future Cash Flows Discounted	3.17%
Minimum [Member]
Other Real Estate Owned Fair Value Adjustments Estimated Selling Costs Percentage	8.00%
Maximum [Member]
Other Real Estate Owned Fair Value Adjustments Estimated Selling Costs Percentage	34.00%
Collateral Impaired Loans [Member]
Collateral Dependent Impaired Loans Carrying Amount	$ 830	$ 893
Allowance for Loan and Lease Losses, Adjustments, Other	63
Other Real Estate Owned [Member]
Allowance for Loan and Lease Losses, Adjustments, Other	$ 35
Number of Real Estate Properties	1
OREO Carrying Amount	$ 22	$ 57