Note 12 - Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Impaired Loans [Member] - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets, Fair Value	$ 4,502	$ 406
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value	0	0
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value	$ 4,502	$ 406