Note 6 - Investments, Available for Sale ("AFS") - Available for Sale Securities Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
One Year or Less, amortized cost, AFS	$ 38
One Year or Less, fair value, AFS	37
After One – Five Years, amortized cost, AFS	10,334
After One – Five Years, fair value, AFS	10,348
After Five – Ten Years, amortized cost, AFS	67,860
After Five – Ten Years, fair value, AFS	63,062
More Than Ten Years, amortized cost, AFS	128,065
More Than Ten Years, fair value, AFS	117,843
Amortized Cost, AFS	577,791	$ 584,287
Available For Sale ("AFS")	532,469	537,640
Collateralized Mortgage-Backed Securities [Member]
Amortized Cost, AFS	371,494	368,081
Available For Sale ("AFS")	$ 341,179	$ 336,170

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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