Note 5 - Investments in Affordable Housing and Alternative Energy Partnerships - Usage of Affordable Housing and Other Tax Credits Including Energy Tax Credit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Affordable housing and other tax credits recognized	$ 40,179	$ 35,448	$ 32,395
Alternative energy tax credits recognized	$ 0	$ 28,517	$ 41,320