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Note 6 - Investments - Available for Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 5,391,584 |  | $ 5,393,623 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | (948) |  |  |
Less: loaned securities | 135,058 |  | 57,499 |  |  |
Fixed-maturity investments available for sale, Total, Fair Value | 5,580,212 |  | 5,723,340 |  |  |
Fixed-maturities available for sale | U.S. government and agencies securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 256,519 |  | 176,033 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 523 |  | 1,677 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1,884) |  | (3,611) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 255,158 |  | 174,099 |  |  |
Fixed-maturities available for sale | State and municipal obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 146,234 |  | 149,258 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 15,134 |  | 16,113 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (357) |  | (100) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 161,011 |  | 165,271 |  |  |
Fixed-maturities available for sale | Corporate bonds and notes |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 2,892,347 |  | 2,832,350 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | $ 0 | (948) | $ (2,290) | $ (2,476) | $ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 155,631 |  | 250,771 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (24,981) |  | (3,758) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 3,022,997 |  | 3,078,415 |  |  |
Fixed-maturities available for sale | RMBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 695,481 |  | 799,814 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 20,925 |  | 34,439 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (3,300) |  | (314) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 713,106 |  | 833,939 |  |  |
Fixed-maturities available for sale | CMBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 680,503 |  | 645,071 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 28,619 |  | 39,495 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2,481) |  | (3,301) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 706,641 |  | 681,265 |  |  |
Fixed-maturities available for sale | CLO |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 558,523 |  | 569,173 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,340 |  | 2,026 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (543) |  | (2,641) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 559,320 |  | 568,558 |  |  |
Fixed-maturities available for sale | Other ABS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 193,727 |  | 249,988 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,768 |  | 2,901 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (476) |  | (432) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 195,019 |  | 252,457 |  |  |
Fixed-maturities available for sale | Foreign government and agency securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 5,107 |  | 5,100 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 237 |  | 338 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0 |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,344 |  | 5,438 |  |  |
Fixed-maturities available for sale | Mortgage insurance-linked notes |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 45,384 |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2,307 |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 |  |  |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 47,691 |  |  |  |  |
Fixed-maturities available for sale | Total fixed-maturities available for sale |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 5,473,825 |  | 5,426,787 |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,391,584 |  | 5,393,623 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | (948) |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 226,484 |  | 347,760 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (34,022) |  | (14,157) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,666,287 |  | 5,759,442 |  |  |
Fixed-maturity investments available for sale, Total, Fair Value | 5,580,212 |  | 5,723,340 |  |  |
Fixed-maturities available for sale | Securities Financing Transaction, Cost | Total fixed-maturities available for sale |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Less: loaned securities | 82,241 |  | 33,164 |  |  |
Fixed-maturities available for sale | Securities Financing Transaction, Fair Value | Total fixed-maturities available for sale |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Less: loaned securities | $ 86,075 |  | $ 36,102 |  |  |

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