Note 22 - Fair Values - Fair Value of Assets Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets measured at fair value	$ 267,954	$ 175,174
Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value	267,954	175,174
Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value
Fair Value, Measurements, Nonrecurring [Member]
Assets measured at fair value	95	1,806
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value	95	1,806
Fair Value, Measurements, Nonrecurring [Member] | Collateral Dependent Impaired Loans [Member]
Assets measured at fair value	60	1,587
Fair Value, Measurements, Nonrecurring [Member] | Collateral Dependent Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Fair Value, Measurements, Nonrecurring [Member] | Collateral Dependent Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Fair Value, Measurements, Nonrecurring [Member] | Collateral Dependent Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value	60	1,587
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member]
Assets measured at fair value	35	219
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value	$ 35	$ 219