Note 12 - Fair Values - Losses Resulting from Non-recurring Fair Value Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Losses resulting from nonrecurring fair value adjustments	$ 76	$ 1,407	$ 153	$ 1,594
Collateral Dependent Impaired Loans [Member]
Losses resulting from nonrecurring fair value adjustments	20	1,359	20	1,523
Other Real Estate Owned [Member]
Losses resulting from nonrecurring fair value adjustments	$ 56	$ 48	$ 133	$ 71