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Note 8 - Equity Investment (Details Textual) - Sisecam Wyoming [Member] - USD ($) $ in Millions | 12 Months Ended
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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 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 -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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