Note 9 - Fair Values (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Minimum [Member]
Other Real Estate Owned Fair Value Adjustments Estimated Selling Costs Percentage	34.00%
Maximum [Member]
Other Real Estate Owned Fair Value Adjustments Estimated Selling Costs Percentage	63.00%
Other Real Estate Owned [Member]
Number of Real Estate Properties	3
OREO Carrying Amount	$ 60	$ 173
Allowance for Loan and Lease Losses, Adjustments, Other	$ 113