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Note 6 - Investments - Contractual Maturities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale Securities, Amortized Cost |  |
Fixed-maturities available for sale—at amortized cost | $ 5,338,536 | $ 4,549,534
Available-for-sale Securities, Fair Value |  |
Less: loaned securities | 57,922 | 66,442
Fixed-maturity investments available for sale, Total, Fair Value | 5,628,992 | 4,688,911
Non asset-backed securities |  |
Available-for-sale Securities, Amortized Cost |  |
Due in one year or less | 94,375 |
Due after one year through five years | 984,406 |
Due after five years through ten years | 1,246,319 |
Due after ten years | 715,219 |
Available-for-sale Securities, Fair Value |  |
Due in one year or less | 94,832 |
Due after one year through five years | 1,034,592 |
Due after five years through ten years | 1,351,007 |
Due after ten years | 783,553 |
Asset-backed and other Mortgage Backed securities |  |
Available-for-sale Securities, Amortized Cost |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost | 2,311,107 |
Available-for-sale Securities, Fair Value |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value | 2,378,463 |
Total fixed-maturities available for sale |  |
Available-for-sale Securities, Amortized Cost |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 5,351,426 |
Available-for-sale Securities, Fair Value |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,642,447 |
Fixed-maturities available for sale | Total fixed-maturities available for sale |  |
Available-for-sale Securities, Amortized Cost |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 5,351,426 | 4,573,387
Fixed-maturities available for sale—at amortized cost | 5,338,536 | 4,549,534
Available-for-sale Securities, Fair Value |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,642,447 | 4,712,924
Fixed-maturity investments available for sale, Total, Fair Value | 5,628,992 | 4,688,911
Fixed-maturities available for sale | Corporate bonds and notes |  |
Available-for-sale Securities, Amortized Cost |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 2,703,446 | 2,136,819
Available-for-sale Securities, Fair Value |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 2,911,812 | 2,241,280
Fixed-maturities available for sale | Securities Financing Transaction, Cost | Corporate bonds and notes |  |
Available-for-sale Securities, Amortized Cost |  |
Less: loaned securities | 12,890 |
Fixed-maturities available for sale | Securities Financing Transaction, Fair Value | Corporate bonds and notes |  |
Available-for-sale Securities, Fair Value |  |
Less: loaned securities | $ 13,455 | $ 24,013

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