Note 6 - Investment and Equity Securities- Amortized Cost and Fair Values of Securities Available for Sale (Details) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Amortized cost	[1]	$ 190,887	$ 191,211
Gross unrealized gains		115	72
Gross unrealized losses		(25,988)	(25,481)
Investment securities available for sale, at fair value		165,014	165,802
Subordinated Debt Securities [Member]
Amortized cost	[1]	34,300	34,300
Gross unrealized gains		86	67
Gross unrealized losses		(1,557)	(1,898)
Investment securities available for sale, at fair value		32,829	32,469
Nontaxable Municipal Bonds [Member]
Amortized cost	[1]	147,634	147,767
Gross unrealized gains		4	4
Gross unrealized losses		(23,787)	(22,805)
Investment securities available for sale, at fair value		123,851	124,966
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Amortized cost	[1]	8,953	9,144
Gross unrealized gains		25	1
Gross unrealized losses		(644)	(778)
Investment securities available for sale, at fair value		$ 8,334	$ 8,367

[1] Accrued interest of $1.5 million is excluded from amortized cost and presented in "accrued interest receivable and other assets" on the Consolidated Balance Sheet.