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Note 8 - Equity Investment (Details Textual) - Sisecam Wyoming [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Equity Method Investment, Ownership Percentage	49.00%
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 6.0	$ (17.9)	$ (6.8)
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	$ 111.9	$ 116.6
Weighted Average Useful Life of Equity Method Investment Difference Between Carrying Amount And Underlying Equity (Year)	27 years

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- Definition

Weighted average useful life of assets (in years)

+ References

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- Definition

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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