Note 4 - Investments - Fixed Maturity Securities by Contractual Maturities (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Due in one year or less, amortized cost	$ 3,123
Due in one year or less, amortized cost, percent	100.00%
Due in one year or less, fair value	$ 3,092
Due in one year or less, fair value, percent	100.00%
Total, amortized cost	$ 3,123
Total, amortized cost, percent	100.00%
Total, fair value	$ 3,092
Total, fair value, percent	100.00%