Note 6 - Investments - Fixed Maturities by Contractual Maturity Periods (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Due in one year or less	$ 8,326
Due in one year or less, estimated fair value	8,306
Due after one year through five years	19,502
Due after one year through five years, estimated fair value	18,674
Due after five years through ten years	5,046
Due after five years through ten years, estimated fair value	4,712
Due after ten years	3,665
Due after ten years, estimated fair value	3,458
Total	36,539	$ 35,889
Total, estimated fair value	$ 35,150	$ 35,666