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Note 2 - Acquisitions - Pro Forma (Details) - Metal-Fab [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) $ / shares
Net sales | $	$ 719,202
Net income (loss) | $	$ 36,943
Basic earnings per share (in dollars per share) | $ / shares	$ 3.20
Diluted earnings per share (in dollars per share) | $ / shares	$ 3.20
Historical OSI [Member]
Net sales | $	$ 696,333
Net income (loss) | $	$ 37,302
Basic earnings per share (in dollars per share) | $ / shares	$ 3.23
Diluted earnings per share (in dollars per share) | $ / shares	$ 3.23
Historical [Member]
Net sales | $	$ 22,685
Net income (loss) | $	$ 4,042
Basic earnings per share (in dollars per share) | $ / shares	$ 0.35
Diluted earnings per share (in dollars per share) | $ / shares	$ 0.35
Pro Forma [Member]
Net sales | $	$ 184
Net income (loss) | $	$ (4,401)
Basic earnings per share (in dollars per share) | $ / shares	$ (0.38)
Diluted earnings per share (in dollars per share) | $ / shares	$ (0.38)

X

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-SubTopic 10
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-SubTopic 10
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-SubTopic 10
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-SubTopic 10
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

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-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

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