Note 7 - Fair Value Measurements and Fair Value of Financial Instruments - Assets Measured on Recurring Basis Using Significant Unobservable Inputs (Details) - US States and Political Subdivisions Debt Securities [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Balance	$ 6,526	$ 7,122
Principal paydowns	(156)	(304)
Change in unrealized gain (loss)	209	(292)
Balance	$ 6,579	$ 6,526