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Note 7 - Investments and Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] |
|  |  | 2023 |  |  | 2022 |
| Fair Value |  | Carrying |  |  | Estimated |  |  | Carrying |  |  | Estimated |
| Hierarchy |  | Value |  |  | Fair Value |  |  | Value |  |  | Fair Value |
Financial instrument not carried at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes (Note 15) | Level 2 |  | $ | 2,833.7 |  |  | $ | 2,735.3 |  |  | $ | 2,342.6 |  |  | $ | 2,113.3 |

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