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Note 7 - Restructuring, Impairment and Plant Closing Costs (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Asset, Impairment Loss | $ 0 | $ 77,000 | $ 0 | $ 77,000
Restructuring Charges (Credits) |  |  | 11,000 |
Restructuring Program to Realign Cost Structure [Member] |  |  |  |
Restructuring Charges |  |  | 0 |
Restructuring and Related Cost, Expected Cost | 0 |  | 0 |
Restructuring Charges (Credits) |  |  |  | (2,000)
Advanced Materials [Member] |  |  |  |
Restructuring Charges (Credits) |  |  | 5,000 |
Performance Products [Member] |  |  |  |
Restructuring Charges (Credits) |  |  | 1,000 |
Polyurethanes [Member] |  |  |  |
Restructuring Charges (Credits) |  |  | 5,000 |
Employee Severance and Accelerated Depreciation [Member] | Advanced Materials [Member] | Restructuring Program to Optimize the Segment’s Manufacturing Processes and Cost Structure [Member] |  |  |  |
Restructuring Charges |  |  | 7,000 | 1,000
Restructuring and Related Cost, Expected Cost | 7,000 |  | 7,000 |
Workforce Reduction and Contract Termination [Member] | Performance Products [Member] | European Maleic Anhydride Manufacturing Facility Closure in Moers Germany[Member] |  |  |  |
Restructuring Charges |  |  | 1,000 | 88,000
Restructuring and Related Cost, Expected Cost | 1,000 |  | 1,000 |
Asset, Impairment Loss |  |  |  | 77,000
Goodwill, Impairment Loss |  |  |  | 14,000
Site Closures, Workforce Reductions and Accelerated Depreciation [Member] | Polyurethanes [Member] | Restructuring Programs to Reduce Organizational Structure Costs [Member] |  |  |  |
Restructuring Charges |  |  | 6,000 | $ 38,000
Restructuring and Related Cost, Expected Cost | $ 1,000 |  | $ 1,000 |

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