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Note 21 - Subsequent Event (Details Textual) - Discontinued Operations, Held-for-sale [Member] - Specialty Service Coatings [Member] $ in Millions | Dec. 31, 2020 USD ($)
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Disposal Group, Including Discontinued Operation, Assets, Total | $ 15.0
Disposal Group, Including Discontinued Operation, Liabilities, Total | $ 3.2

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