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Note 6 - Restructuring, Impairment and Plant Closing Costs (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Employee Severance [Member] | Polyurethanes [Member] |  |  |  |
Restructuring Charges |  |  | $ 5,000 | $ 7,000
Restructuring and Related Cost, Expected Cost | $ 0 |  | 0 |
Site Closure [Member] | Advanced Materials [Member] |  |  |  |
Restructuring Charges |  |  | 4,000 | 1,000
Restructuring and Related Cost, Expected Cost | 1,000 |  | 1,000 |
Restructuring Program to Realign Cost Structure [Member] |  |  |  |
Restructuring Charges |  |  | 2,000 |
Restructuring and Related Cost, Expected Cost | 12,000 |  | 12,000 |
Program to Optimize Global Approach to Leveraging Shared Services Capabilities [Member] | Employee Severance [Member] | Corporate, Non-Segment [Member] |  |  |  |
Restructuring Charges | 6,000 |  |  | $ 15,000
Restructuring and Related Cost, Expected Cost | $ 1,000 |  | $ 1,000 |
Program to Optimize Global Approaches to Leveraging Managed Services in Various Information Technology Functions [Member] | Employee Severance [Member] |  |  |  |
Restructuring Charges |  | $ 12,000 |  |

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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482017/420-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479823/420-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479823/420-10-S99-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482017/420-10-50-1 + Details
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