Note 2 - Acquisitions - Pro Forma (Details) - Metal-Fab [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2022
Net sales	$ 733,477	$ 1,452,679
Net income (loss)	$ 38,610	$ 75,553
Basic earnings per share (in dollars per share)	$ 3.35	$ 6.55
Diluted earnings per share (in dollars per share)	$ 3.35	$ 6.55
Historical OSI [Member]
Net sales	$ 709,176	$ 1,405,509
Net income (loss)	$ 37,624	$ 74,926
Basic earnings per share (in dollars per share)	$ 3.26	$ 6.49
Diluted earnings per share (in dollars per share)	$ 3.26	$ 6.49
Historical [Member]
Net sales	$ 24,117	$ 46,802
Net income (loss)	$ 3,803	$ 7,845
Basic earnings per share (in dollars per share)	$ 0.33	$ 0.68
Diluted earnings per share (in dollars per share)	$ 0.33	$ 0.68
Pro Forma [Member]
Net sales	$ 184	$ 368
Net income (loss)	$ (2,817)	$ (7,218)
Basic earnings per share (in dollars per share)	$ (0.24)	$ (0.63)
Diluted earnings per share (in dollars per share)	$ (0.24)	$ (0.63)

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.

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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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ 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
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

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