Note 4 - Investments - Fixed Maturity Securities by Contractual Maturities (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Due in one year or less, amortized cost	$ 2,122
Due in one year or less, amortized cost, percent	68.00%
Due in one year or less, fair value	$ 2,096
Due in one year or less, fair value, percent	67.90%
Due after one year through five years, amortized cost	$ 1,000
Due after one year through five years, amortized cost, percent	32.00%
Due after one year through five years, fair value	$ 990
Due after one year through five years, fair value, percent	32.10%
Due after five years through ten years, amortized cost	$ 0
Due after five years through ten years, amortized cost, percent	0.00%
Due after five years through ten years, fair value	$ 0
Due after five years through ten years, fair value, percent	0.00%
Due after ten years, amortized cost	$ 0
Due after ten years, amortized cost, percent	0.00%
Due after ten years, fair value	$ 0
Due after ten years, fair value, percent	0.00%
Total, amortized cost	$ 3,122
Total, amortized cost, percent	100.00%
Total, fair value	$ 3,086
Total, fair value, percent	100.00%