Note 16 - Fair Value Measurements - Assets Measured on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Impaired loans, net of valuation allowance	$ 370	$ 759
Other real estate owned, net	984	1,308
Repossessions	362
Fair Value, Inputs, Level 1 [Member]
Impaired loans, net of valuation allowance	0	0
Other real estate owned, net		0
Repossessions	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans, net of valuation allowance	0	0
Other real estate owned, net	0	0
Repossessions	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans, net of valuation allowance	370	759
Other real estate owned, net	984	$ 1,308
Repossessions	$ 362