Note 7 - Investment and Equity Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Due in one year or less, amortized costs	$ 570
Due in one year or less, fair value	570
Due after one year through five years, amortized costs	2,935
Due after one year through five years, fair value	2,870
Due after five years through ten years, amortized costs	47,291
Due after five years through ten years, fair value	45,336
Due after ten years, amortized costs	143,181
Due after ten years, fair value	120,829
Amortized costs	193,977	$ 192,998
Fair Value	$ 169,605	$ 164,967