Note 6 - Reserve for Losses and Loss Adjustment Expenses - Reconciliation of Changes in Reserve Balance for Losses and Loss Adjustment Expenses (Parentheticals) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2026 |
|
| Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract] | ||
| Incurred losses | $ 6.2 | $ 18.5 |