Note 6 - Investments - Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Total	$ 35,889	$ 20,488
Gross Unrealized Gains	67	234
Gross Unrealized Losses	290	6
Fixed maturities, at fair value (amortized cost of $35,889 and $20,488, respectively)	35,666	20,716
Total, estimated fair value	35,666	20,716
US Government Agencies Debt Securities [Member]
Total	16,276	9,999
Gross Unrealized Gains	31	105
Gross Unrealized Losses	84	0
Fixed maturities, at fair value (amortized cost of $35,889 and $20,488, respectively)	16,223	10,104
Total, estimated fair value	16,223	10,104
US States and Political Subdivisions Debt Securities [Member]
Total	1,880	1,447
Gross Unrealized Gains	3	7
Gross Unrealized Losses	5	0
Fixed maturities, at fair value (amortized cost of $35,889 and $20,488, respectively)	1,878	1,454
Total, estimated fair value	1,878	1,454
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Total	7,679	5,334
Gross Unrealized Gains	18	66
Gross Unrealized Losses	68	6
Fixed maturities, at fair value (amortized cost of $35,889 and $20,488, respectively)	7,629	5,394
Total, estimated fair value	7,629	5,394
Asset-backed Securities [Member]
Total	449
Gross Unrealized Gains	0
Gross Unrealized Losses	4
Fixed maturities, at fair value (amortized cost of $35,889 and $20,488, respectively)	445
Total, estimated fair value	445
Corporate Debt Securities [Member]
Total	9,605	3,708
Gross Unrealized Gains	15	56
Gross Unrealized Losses	129	0
Fixed maturities, at fair value (amortized cost of $35,889 and $20,488, respectively)	9,491	3,764
Total, estimated fair value	$ 9,491	$ 3,764