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Note 5 - Acquisition and Divestiture (Details Textual) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Dec. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Gain (Loss) on Disposition of Business			$ 9.8	$ (0.0)
Payment for Contingent Consideration Liability, Financing Activities			$ 0.5	$ (0.0)
Gaomei [Member]
Payment for Contingent Consideration Liability, Financing Activities	$ 0.5
Gaomei [Member] | Forecast [Member]
Payment for Contingent Consideration Liability, Financing Activities		$ 2.0
Specialty Service Coatings [Member] | Selling, General and Administrative Expenses [Member]
Gain (Loss) on Disposition of Business	$ 9.8

X

- Definition

Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684

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- Definition

Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date.

+ References

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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

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