Note 5 - Fair Value Measurements - Assets Measured on a Nonrecurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Collateral-dependent loans	$ 3,087	$ 3,321
Fair Value, Inputs, Level 1 [Member]
Collateral-dependent loans	0	0
Fair Value, Inputs, Level 2 [Member]
Collateral-dependent loans	0	0
Fair Value, Inputs, Level 3 [Member]
Collateral-dependent loans	$ 3,087	$ 3,321