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Note 11 - Long-term Debt (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Feb. 28, 2022 | Dec. 31, 2023 | Jan. 31, 2024 | Dec. 31, 2022 | Dec. 31, 2021
Senior Notes |  |  | $ 60,000,000 |  | $ 90,000,000 |
The Term Loan [Member] |  |  |  |  |  |
Long-Term Debt, Total |  |  |  |  | $ 407,000,000 | $ 440,000,000
Senior Unsecured Notes [Member] |  |  |  |  |  |
Senior Notes |  |  | $ 60,000,000 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 450,000,000 |  |  |  |  |
Debt Instrument, Term (Year) | 3 years |  |  |  |  |
Senior Unsecured Notes [Member] | NYL Investors LLC [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 150,000,000 |  |  |  |  |
Senior Unsecured Notes [Member] | PGIM Private Capital [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 300,000,000 |  |  |  |  |
Private Placement 4.53% Notes [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.53% |  |  |  |  |
Debt Instrument, Face Amount | $ 60,000,000 |  |  |  |  |
Private Placement 5.48 Notes% [Member] | Subsequent Event [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.48% |  |
Debt Instrument, Face Amount |  |  |  | $ 50,000,000 |  |
Private Placement 5.60% Notes [Member] | Subsequent Event [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.60% |  |
Debt Instrument, Face Amount |  |  |  | $ 25,000,000 |  |
Private Placement 5.64% Notes [Member] | Subsequent Event [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.64% |  |
Debt Instrument, Face Amount |  |  |  | $ 50,000,000 |  |
Credit Agreement and Senior Notes [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 5.97% |  | 3.78% |
Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 1,000,000 |  |  |  | $ 450,000,000
Debt, Weighted Average Interest Rate |  |  | 6.29% |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 155,450,000 |  |  |
Letters of Credit Outstanding, Amount |  |  | 19,050,000 |  | $ 15,655,000 |
Revolving Credit Facility [Member] | Credit Agreement Accordion [Member] |  |  |  |  |  |
Proceeds from Lines of Credit |  |  | $ 250,000,000 |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.20% |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.50% |  |  |  |
Senior Notes [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.84% |  |  |

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