Note 15 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Other real estate owned losses	$ 109	$ (64)
Fair Value, Measurements, Nonrecurring [Member]
Collateral dependent impaired loans	4,735		$ 2,569
Collateral dependent impaired loans losses	(1,419)	(307)
Other real estate owned	360		2,640
Other real estate owned losses		(171)
Assets, Fair Value Disclosure	5,095		5,209
Total losses	(1,419)	$ (478)
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Collateral dependent impaired loans
Other real estate owned
Assets, Fair Value Disclosure
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Collateral dependent impaired loans
Other real estate owned
Assets, Fair Value Disclosure
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent impaired loans	4,735		2,569
Other real estate owned	360		2,640
Assets, Fair Value Disclosure	$ 5,095		$ 5,209