Note 2 - Summary of Significant Accounting Policies - Amortized Cost to Fair Value of HTM Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Amortized cost	$ 20,152	$ 21,059
Gross unrecognized gains	66	50
Gross unrecognized losses	(1)	(33)
Fair value	$ 20,217	$ 21,076