Note 2 - Investments, Available for Sale ("AFS") - Available for Sale Securities Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Due in one year or less, amortized cost	$ 113
Due in one year or less, fair value	112
Due after one year to five years, amortized cost	13,386
Due after one year to five years, fair value	12,860
Due after five to ten years, amortized cost	55,904
Due after five to ten years, fair value	50,348
Due after ten years or more, amortized cost	108,034
Due after ten years or more, fair value	99,308
Amortized cost, AFS	567,029	$ 584,287
Fair value, AFS	525,623	537,640
Collateralized Mortgage-Backed Securities [Member]
MBS, amortized cost	389,592
MBS, Fair Value, AFS	362,995
Amortized cost, AFS	389,592	368,081
Fair value, AFS	$ 362,995	$ 336,170