Note 6 - Investments - Fixed Maturities by Contractual Maturity Periods (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Due in one year or less	$ 7,998
Due in one year or less, estimated fair value	7,917
Due after one year through five years	23,147
Due after one year through five years, estimated fair value	21,954
Due after five years through ten years	3,570
Due after five years through ten years, estimated fair value	3,244
Due after ten years	4,216
Due after ten years, estimated fair value	3,898
Total	38,931	$ 35,889
Total, estimated fair value	$ 37,013	$ 35,666