Note 11 - Fair Values - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Collateral dependent loans	$ 1,573	$ 1,434
Foreclosed assets	200	200
Total	1,773	1,634
Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans	0	0
Foreclosed assets	0	0
Total	0	0
Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans	0	0
Foreclosed assets	0	0
Total	0	0
Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans	1,573	1,434
Foreclosed assets	200	200
Total	$ 1,773	$ 1,634