Note 6 - Investments and Equity Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Due in one year or less, amortized costs	$ 567
Due in one year or less, fair value	567
Due after one year through five years, amortized costs	2,116
Due after one year through five years, fair value	2,048
Due after five years through ten years, amortized costs	54,815
Due after five years through ten years, fair value	52,045
Due after ten years, amortized costs	133,648
Due after ten years, fair value	116,119
Amortized costs	191,146	$ 192,998
Fair Value	$ 170,779	$ 164,967