Note 6 - Investments - Fixed Maturities by Contractual Maturity Periods (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Due in one year or less	$ 8,424
Due in one year or less, estimated fair value	8,450
Due after one year through five years	22,371
Due after one year through five years, estimated fair value	22,174
Due after five years through ten years	1,831
Due after five years through ten years, estimated fair value	1,823
Due after ten years	3,263
Due after ten years, estimated fair value	3,219
Total	35,889	$ 20,488
Total, estimated fair value	$ 35,666	$ 20,716