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Note 6 - Investments - Contractual Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale Securities, Amortized Cost |  |
Fixed-maturities, Available-for-sale, Amortized Cost | $ 5,393,623 | $ 4,549,534
Available-for-sale Securities, Fair Value |  |
Fixed-maturities available for sale—at fair value | 5,723,340 | 4,688,911
Securities Loaned, Asset | 57,499 | 66,442
Fixed-maturities available for sale | Non Asset Backed Security Investments, Contractual Maturities |  |
Available-for-sale Securities, Amortized Cost |  |
Due in one year or less | 125,361 |
Due after one year through five years | 1,002,786 |
Due after five years through ten years | 1,225,712 |
Due after ten years | 808,882 |
Available-for-sale Securities, Fair Value |  |
Due in one year or less | 126,414 |
Due after one year through five years | 1,062,579 |
Due after five years through ten years | 1,338,147 |
Due after ten years | 896,083 |
Fixed-maturities available for sale | RMBS |  |
Available-for-sale Securities, Fair Value |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 799,814 | 766,429
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 833,939 | 779,354
Fixed-maturities available for sale | CMBS |  |
Available-for-sale Securities, Fair Value |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 645,071 | 574,037
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 681,265 | 588,420
Fixed-maturities available for sale | Other ABS |  |
Available-for-sale Securities, Fair Value |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 249,988 | 314,946
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 252,457 | 316,163
Fixed-maturities available for sale | Total fixed-maturities available for sale |  |
Available-for-sale Securities, Amortized Cost |  |
Fixed-maturities, Available-for-sale, Amortized Cost | 5,393,623 | 4,549,534
Available-for-sale Securities, Fair Value |  |
Fixed-maturities available for sale—at fair value | 5,723,340 | 4,688,911
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 5,426,787 | 4,573,387
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,759,442 | 4,712,924
Fixed-maturities available for sale | Asset-backed and other Mortgage Backed securities [Member] |  |
Available-for-sale Securities, Amortized Cost |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 2,264,046 |
Available-for-sale Securities, Fair Value |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 2,336,219 |
Securities Financing Transaction, Amortized Cost | Fixed-maturities available for sale | Total fixed-maturities available for sale |  |
Available-for-sale Securities, Fair Value |  |
Securities Loaned, Asset | 33,164 | 23,853
Securities Financing Transaction, Fair Value | Fixed-maturities available for sale |  |
Available-for-sale Securities, Fair Value |  |
Securities Loaned, Asset | 36,100 |
Securities Financing Transaction, Fair Value | Fixed-maturities available for sale | Total fixed-maturities available for sale |  |
Available-for-sale Securities, Fair Value |  |
Securities Loaned, Asset | $ 36,102 | $ 24,013

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