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Note 5 - Fair Value of Financial Instruments Fair Value Assets Liabilities by Hierarchy Level (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Loaned securities | $ 66,442,000 |  | $ 27,860,000 |
Other Investments | 4,072,000 |  | 3,415,000 |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 5,654,675,000 | [1] | 5,149,614,000 | [2]
Total Assets at Fair Value | 5,721,117,000 | [1] | 5,177,474,000 | [2]
Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 4,688,911,000 |  | 4,021,575,000 |
Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 317,150,000 |  | 469,071,000 |
Equity securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 130,221,000 |  | 130,565,000 |
Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 518,393,000 |  | 528,403,000 |
Partnership investment | Carrying (Reported) Amount, Fair Value Disclosure |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Other Investments | 2,600,000 |  | 3,400,000 |
Convertible promissory note | Carrying (Reported) Amount, Fair Value Disclosure |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Other Investments | 1,500,000 |  |  |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 597,506,000 | [1] | 411,054,000 | [2]
Total Assets at Fair Value | 660,279,000 | [1] | 431,096,000 | [2]
Fair Value, Inputs, Level 1 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 143,884,000 |  | 55,658,000 |
Fair Value, Inputs, Level 1 | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
Fair Value, Inputs, Level 1 | Equity securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 124,009,000 |  | 126,607,000 |
Fair Value, Inputs, Level 1 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 329,613,000 |  | 228,789,000 |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 5,057,169,000 | [1] | 4,738,560,000 | [2]
Total Assets at Fair Value | 5,060,838,000 | [1] | 4,746,378,000 | [2]
Fair Value, Inputs, Level 2 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 4,545,027,000 |  | 3,965,917,000 |
Fair Value, Inputs, Level 2 | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 317,150,000 |  | 469,071,000 |
Fair Value, Inputs, Level 2 | Equity securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 6,212,000 |  | 3,958,000 |
Fair Value, Inputs, Level 2 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 188,780,000 |  | 299,614,000 |
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Assets at Fair Value | 0 |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | 0 |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net | 0 |  | 0 |
Financial Liabilities Fair Value Disclosure | 0 |  | 0 |
Securities Financing Transaction, Fair Value | Fixed-maturities available for sale |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Loaned securities | 24,000,000.0 |  |  |
Securities Financing Transaction, Fair Value | Equity securities |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Loaned securities | 27,500,000 |  |  |
Securities Financing Transaction, Fair Value | Short-term investments |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Loaned securities | 14,900,000 |  |  |
US government and agency securities | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 179,584,000 |  | 84,070,000 |
US government and agency securities | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 127,152,000 |  | 133,657,000 |
US government and agency securities | Fair Value, Inputs, Level 1 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 143,884,000 |  | 55,658,000 |
US government and agency securities | Fair Value, Inputs, Level 1 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 127,152,000 |  | 133,657,000 |
US government and agency securities | Fair Value, Inputs, Level 2 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 35,700,000 |  | 28,412,000 |
US government and agency securities | Fair Value, Inputs, Level 2 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
US government and agency securities | Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Loaned securities | 35,309,000 | [3] | 9,987,000 | [4]
US government and agency securities | Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Loaned securities | 35,309,000 | [3] | 9,987,000 | [4]
US government and agency securities | Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Loaned securities | 0 | [3] | 0 | [4]
State and municipal obligations | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 119,994,000 |  | 138,313,000 |
State and municipal obligations | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 118,949,000 |  | 168,359,000 |
State and municipal obligations | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 21,475,000 |  | 18,070,000 |
State and municipal obligations | Fair Value, Inputs, Level 1 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
State and municipal obligations | Fair Value, Inputs, Level 1 | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
State and municipal obligations | Fair Value, Inputs, Level 1 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
State and municipal obligations | Fair Value, Inputs, Level 2 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 119,994,000 |  | 138,313,000 |
State and municipal obligations | Fair Value, Inputs, Level 2 | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 118,949,000 |  | 168,359,000 |
State and municipal obligations | Fair Value, Inputs, Level 2 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 21,475,000 |  | 18,070,000 |
Money market instruments | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 202,461,000 |  | 95,132,000 |
Money market instruments | Fair Value, Inputs, Level 1 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 202,461,000 |  | 95,132,000 |
Money market instruments | Fair Value, Inputs, Level 2 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
Corporate bonds and notes | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 2,237,611,000 |  | 2,222,473,000 |
Corporate bonds and notes | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 147,232,000 |  | 228,152,000 |
Corporate bonds and notes | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 20,298,000 |  | 105,625,000 |
Corporate bonds and notes | Fair Value, Inputs, Level 1 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
Corporate bonds and notes | Fair Value, Inputs, Level 1 | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
Corporate bonds and notes | Fair Value, Inputs, Level 1 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
Corporate bonds and notes | Fair Value, Inputs, Level 2 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 2,237,611,000 |  | 2,222,473,000 |
Corporate bonds and notes | Fair Value, Inputs, Level 2 | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 147,232,000 |  | 228,152,000 |
Corporate bonds and notes | Fair Value, Inputs, Level 2 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 20,298,000 |  | 105,625,000 |
Corporate bonds and notes | Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Loaned securities | 3,669,000 | [3] | 7,818,000 | [4]
Corporate bonds and notes | Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Loaned securities | 0 | [3] | 0 | [4]
Corporate bonds and notes | Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Loaned securities | 3,669,000 | [3] | 7,818,000 | [4]
RMBS | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 779,354,000 |  | 332,142,000 |
RMBS | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 16,180,000 |  | 21,082,000 |
RMBS | Fair Value, Inputs, Level 1 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
RMBS | Fair Value, Inputs, Level 1 | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
RMBS | Fair Value, Inputs, Level 2 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 779,354,000 |  | 332,142,000 |
RMBS | Fair Value, Inputs, Level 2 | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 16,180,000 |  | 21,082,000 |
CMBS | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 608,015,000 |  | 539,915,000 |
CMBS | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 34,789,000 |  | 51,478,000 |
CMBS | Fair Value, Inputs, Level 1 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
CMBS | Fair Value, Inputs, Level 1 | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
CMBS | Fair Value, Inputs, Level 2 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 608,015,000 |  | 539,915,000 |
CMBS | Fair Value, Inputs, Level 2 | Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 34,789,000 |  | 51,478,000 |
Other ABS | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 759,129,000 |  | 704,662,000 |
Other ABS | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value |  |  | 806,000 |
Other ABS | Fair Value, Inputs, Level 1 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  | 0 |
Other ABS | Fair Value, Inputs, Level 1 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value |  |  | 0 |
Other ABS | Fair Value, Inputs, Level 2 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 759,129,000 |  | 704,662,000 |
Other ABS | Fair Value, Inputs, Level 2 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value |  |  | 806,000 |
Foreign government and agency securities | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 5,224,000 |  |  |
Foreign government and agency securities | Fair Value, Inputs, Level 1 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 |  |  |
Foreign government and agency securities | Fair Value, Inputs, Level 2 | Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 5,224,000 |  |  |
Other investments | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 147,007,000 | [5] | 175,113,000 | [6]
Other investments | Fair Value, Inputs, Level 1 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 0 | [5] | 0 | [6]
Other investments | Fair Value, Inputs, Level 2 | Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Total Investments at Fair Value | 147,007,000 | [5] | 175,113,000 | [6]
Equity securities | Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Loaned securities | 27,464,000 | [3] | 10,055,000 | [4]
Equity securities | Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Loaned securities | 27,464,000 | [3] | 10,055,000 | [4]
Equity securities | Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |
Loaned securities | $ 0 | [3] | $ 0 | [4]
[1] | Does not include other invested assets of $2.6 million that are primarily invested in limited partnership investments valued using the net asset value as a practical expedient and $1.5 million invested in a private convertible promissory note.
[2] | Does not include other invested assets of $3.4 million that are primarily invested in limited partnerships valued using the net asset value as a practical expedient.
[3] | Securities loaned to third-party borrowers under securities lending agreements are classified as other assets in our consolidated balance sheets. See Note 6 for more information.
[4] | Securities loaned to third-party borrowers under securities lending agreements are classified as other assets in our consolidated balance sheets. See Note 6 for more information.
[5] | Comprising short-term certificates of deposit and commercial paper.
[6] | Comprising short-term certificates of deposit and commercial paper.

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