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Note 4 - Investments and Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] |
|  |  | September 30, 2023 |  |  | December 31, 2022 |
| Fair Value |  | Carrying |  |  | Estimated |  |  | Carrying |  |  | Estimated |
| Hierarchy |  | Value |  |  | Fair Value |  |  | Value |  |  | Fair Value |
Financial instruments not carried at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes (Note 10) | Level 2 |  | $ | 2,833.7 |  |  | $ | 2,567.6 |  |  | $ | 2,342.6 |  |  | $ | 2,113.3 |

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