Note 20 - Assets and Liabilities Measured and Reported at Fair Value - Significant Unobservable Inputs (Details) - Appraisal Discount Method [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Impaired Loans [Member]
Assets, Fair Value Disclosure	$ 2,600	$ 2,900
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure	$ 2,569
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]
Weighted average of input	11.50%
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure	$ 2,640
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]
Weighted average of input	23.40%