Note 23 - Fair Values - Fair Value of Assets Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets measured at fair value	$ 175,174	$ 159,030
Fair Value, Measurements, Nonrecurring [Member]
Assets measured at fair value	1,806	1,450
Collateral Dependent Impaired Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets measured at fair value	1,587	707
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets measured at fair value	219	743
Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets measured at fair value	1,806	1,450
Fair Value, Inputs, Level 1 [Member] | Collateral Dependent Impaired Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets measured at fair value	1,587	707
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets measured at fair value	219	743
Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value	175,174	159,030
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets measured at fair value
Fair Value, Inputs, Level 2 [Member] | Collateral Dependent Impaired Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets measured at fair value
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets measured at fair value
Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets measured at fair value
Fair Value, Inputs, Level 3 [Member] | Collateral Dependent Impaired Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets measured at fair value
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets measured at fair value