Note 9 - Fair Values - Losses Resulting From Non-recurring Fair Value Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Losses resulting from nonrecurring fair value adjustments	$ 425	$ 66	$ 467	$ 162
Collateral Dependent Impaired Loans [Member]
Losses resulting from nonrecurring fair value adjustments	425		467
Other Real Estate Owned [Member]
Losses resulting from nonrecurring fair value adjustments		$ 66		$ 162