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Note 9 - Fair Value (Tables) | 9 Months Ended
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Sep. 30, 2023
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | September 30, 2023 |  |  | December 31, 2022 |
|  | Carrying |  |  | Estimated |  |  | Carrying |  |  | Estimated |
|  | value |  |  | fair value |  |  | value |  |  | fair value |
Non-qualified employee benefit plan investments |  | $ | 15 |  |  | $ | 15 |  |  | $ | 15 |  |  | $ | 15 |
Investment in Venator |  |  | — |  |  |  | — |  |  |  | 5 |  |  |  | 5 |
Long-term debt (including current portion) |  |  | (1,606 | ) |  |  | (1,455 | ) |  |  | (1,737 | ) |  |  | (1,578 | )

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