Note 6 - Affordable Housing Tax Credit Limited Partnership Investments - Activity in Affordable Housing Program Obligation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Affordable housing tax credit investment	$ 18,950		$ 18,950
Less amortization	6,444		6,044
Net affordable housing tax credit investment	12,506		12,906
Unfunded commitment	$ 3,819		$ 4,426
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income	Income Tax Expense (Benefit)	Income Tax Expense (Benefit)
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration]	Deferred Income Tax Expense (Benefit)	Deferred Income Tax Expense (Benefit)
Tax credits and other tax benefits recognized	$ 485	$ 443
Tax credit amortization expense included in provision for income taxes	$ 400	$ 372