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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