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Note 2 - Investments (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] | The Company’s available‑for‑sale investments are summarized as follows:
|  | Amortized |  |  | Gross |  |  | Gross |  |  | Allowance for |  |  |  |
|  | Cost or |  |  | Unrealized |  |  | Unrealized |  |  | Credit |  |  | Fair |
September 30, 2025 |  | Cost |  |  | Gains |  |  | Losses |  |  | Losses |  |  | Value |
|  | (in thousands) |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Governments |  | $ | 24,831 |  |  | $ | 85 |  |  | $ | (279 | ) |  | $ | — |  |  | $ | 24,637 |
U.S. States, Territories, and Political Subdivisions |  |  | 19,789 |  |  |  | 104 |  |  |  | (1,178 | ) |  |  | — |  |  |  | 18,715 |
Special revenue excluding mortgage/asset-backed securities |  |  | 19,292 |  |  |  | 36 |  |  |  | (2,125 | ) |  |  | — |  |  |  | 17,203 |
Corporate and other |  |  | 601,329 |  |  |  | 10,080 |  |  |  | (8,526 | ) |  |  | — |  |  |  | 602,883 |
Mortgage/asset-backed securities |  |  | 481,614 |  |  |  | 5,212 |  |  |  | (8,897 | ) |  |  | — |  |  |  | 477,929 |
Total available-for-sale investments |  | $ | 1,146,855 |  |  | $ | 15,517 |  |  | $ | (21,005 | ) |  | $ | — |  |  | $ | 1,141,367 |
|  | Amortized |  |  | Gross |  |  | Gross |  |  | Allowance for |  |  |  |
|  | Cost or |  |  | Unrealized |  |  | Unrealized |  |  | Credit |  |  | Fair |
December 31, 2024 |  | Cost |  |  | Gains |  |  | Losses |  |  | Losses |  |  | Value |
|  | (in thousands) |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Governments |  | $ | 33,449 |  |  | $ | 6 |  |  | $ | (649 | ) |  | $ | — |  |  | $ | 32,806 |
U.S. States, Territories, and Political Subdivisions |  |  | 10,606 |  |  |  | 29 |  |  |  | (857 | ) |  |  | — |  |  |  | 9,778 |
Special revenue excluding mortgage/asset-backed securities |  |  | 30,283 |  |  |  | 85 |  |  |  | (3,734 | ) |  |  | — |  |  |  | 26,634 |
Corporate and other |  |  | 492,395 |  |  |  | 1,689 |  |  |  | (18,349 | ) |  |  | (244 | ) |  |  | 475,491 |
Mortgage/asset-backed securities |  |  | 406,597 |  |  |  | 1,408 |  |  |  | (13,668 | ) |  |  | — |  |  |  | 394,337 |
Total available-for-sale investments |  | $ | 973,330 |  |  | $ | 3,217 |  |  | $ | (37,257 | ) |  | $ | (244 | ) |  | $ | 939,046 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] | The aggregate fair value and gross unrealized losses of the Company’s investments aggregated by investment category and the length of time these individual securities have been in a continuous unrealized loss position as of September 30, 2025 and December 31, 2024, are as follows:
|  | Less Than 12 Months |  |  | More Than 12 Months |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
September 30, 2025 |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (in thousands) |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Governments |  | $ | 1,600 |  |  | $ | (45 | ) |  | $ | 8,161 |  |  | $ | (234 | ) |  | $ | 9,761 |  |  | $ | (279 | )
U.S. States, Territories, and Political Subdivisions |  |  | 5,181 |  |  |  | (541 | ) |  |  | 9,342 |  |  |  | (637 | ) |  |  | 14,523 |  |  |  | (1,178 | )
Special revenue excluding mortgage/asset-backed securities |  |  | 230 |  |  |  | (7 | ) |  |  | 14,939 |  |  |  | (2,118 | ) |  |  | 15,169 |  |  |  | (2,125 | )
Corporate and other |  |  | 61,100 |  |  |  | (1,392 | ) |  |  | 143,594 |  |  |  | (7,134 | ) |  |  | 204,694 |  |  |  | (8,526 | )
Mortgage/asset-backed securities |  |  | 35,994 |  |  |  | (497 | ) |  |  | 88,658 |  |  |  | (8,400 | ) |  |  | 124,652 |  |  |  | (8,897 | )
Total available-for-sale investments |  | $ | 104,105 |  |  | $ | (2,482 | ) |  | $ | 264,694 |  |  | $ | (18,523 | ) |  | $ | 368,799 |  |  | $ | (21,005 | )
|  | Less Than 12 Months |  |  | More Than 12 Months |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
December 31, 2024 |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (in thousands) |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Governments |  | $ | 16,507 |  |  | $ | (65 | ) |  | $ | 14,291 |  |  | $ | (584 | ) |  | $ | 30,798 |  |  | $ | (649 | )
U.S. States, Territories, and Political Subdivisions |  |  | 2,614 |  |  |  | (419 | ) |  |  | 5,076 |  |  |  | (438 | ) |  |  | 7,690 |  |  |  | (857 | )
Special revenue excluding mortgage/asset-backed securities |  |  | 2,182 |  |  |  | (426 | ) |  |  | 21,733 |  |  |  | (3,308 | ) |  |  | 23,915 |  |  |  | (3,734 | )
Corporate and other |  |  | 181,179 |  |  |  | (4,996 | ) |  |  | 176,531 |  |  |  | (13,353 | ) |  |  | 357,710 |  |  |  | (18,349 | )
Mortgage/asset-backed securities |  |  | 152,287 |  |  |  | (2,820 | ) |  |  | 91,572 |  |  |  | (10,848 | ) |  |  | 243,859 |  |  |  | (13,668 | )
Total available-for-sale investments |  | $ | 354,769 |  |  | $ | (8,726 | ) |  | $ | 309,203 |  |  | $ | (28,531 | ) |  | $ | 663,972 |  |  | $ | (37,257 | )
Investments Classified by Contractual Maturity Date [Table Text Block] | The amortized cost and fair value of fixed maturity securities at September 30, 2025, by contractual maturity, are shown below.
|  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
|  | (in thousands) |
Due within one year |  | $ | 71,849 |  |  | $ | 71,977 |
Due after one year through five years |  |  | 260,401 |  |  |  | 260,035 |
Due after five years through ten years |  |  | 226,631 |  |  |  | 228,747 |
Due after ten years |  |  | 106,360 |  |  |  | 102,679 |
Mortgage and asset-backed securities |  |  | 481,614 |  |  |  | 477,929 |
|  | $ | 1,146,855 |  |  | $ | 1,141,367 |
Investment Income [Table Text Block] | Net investment income is summarized as follows:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | (in thousands) |  |  | (in thousands) |
Interest income |  | $ | 14,515 |  |  | $ | 9,365 |  |  | $ | 39,824 |  |  | $ | 24,317 |
Dividend income |  |  | 298 |  |  |  | 220 |  |  |  | 857 |  |  |  | 675 |
Investment expense |  |  | (241 | ) |  |  | (177 | ) |  |  | (667 | ) |  |  | (486 | )
Net investment income |  | $ | 14,572 |  |  | $ | 9,408 |  |  | $ | 40,014 |  |  | $ | 24,506 |
Gain (Loss) on Securities [Table Text Block] | The following table presents net realized and unrealized investment gains and losses:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | (in thousands) |  |  | (in thousands) |
Realized gains: |  |  |  |  |  |  |  |  |  |  |  |
Gains on sales of fixed maturity securities |  | $ | 29 |  |  | $ | 42 |  |  | $ | 463 |  |  | $ | 59 |
Gains on sales of equity securities |  |  | — |  |  |  | — |  |  |  | 234 |  |  |  | — |
Total realized gains |  |  | 29 |  |  |  | 42 |  |  |  | 697 |  |  |  | 59 |
Realized losses: |  |  |  |  |  |  |  |  |  |  |  |
Losses on sales of fixed maturity securities |  |  | (25 | ) |  |  | (328 | ) |  |  | (783 | ) |  |  | (330 | )
Losses on sales of equity securities |  |  | — |  |  |  | — |  |  |  | (235 | ) |  |  | (1,204 | )
Total realized losses |  |  | (25 | ) |  |  | (328 | ) |  |  | (1,018 | ) |  |  | (1,534 | )
Net realized investment gains (losses) |  |  | 4 |  |  |  | (286 | ) |  |  | (321 | ) |  |  | (1,475 | )
Change in allowance for credit losses |  |  | — |  |  |  | 327 |  |  |  | 244 |  |  |  | — |
Net unrealized gains on equity securities |  |  | 2,862 |  |  |  | 2,434 |  |  |  | 6,190 |  |  |  | 7,052 |
Net unrealized gains (losses) on equity method investment |  |  | — |  |  |  | 148 |  |  |  | 2,268 |  |  |  | (118 | )
Net unrealized gains on other investments |  |  | 627 |  |  |  | 111 |  |  |  | 1,080 |  |  |  | 309 |
Net realized and unrealized gains on investments |  | $ | 3,493 |  |  | $ | 2,734 |  |  | $ | 9,461 |  |  | $ | 5,768 |

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