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Note 2 - Acquisitions - Pro Forma (Details) - Metal-Fab [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022
Net sales | $ 660,424 | $ 2,113,103
Net income (loss) | $ 14,252 | $ 89,805
Basic earnings per share (in dollars per share) | $ 1.23 | $ 7.78
Diluted earnings per share (in dollars per share) | $ 1.23 | $ 7.78
Historical OSI [Member] |  |
Net sales | $ 634,437 | $ 2,039,946
Net income (loss) | $ 12,046 | $ 86,972
Basic earnings per share (in dollars per share) | $ 1.04 | $ 7.53
Diluted earnings per share (in dollars per share) | $ 1.04 | $ 7.53
Historical [Member] |  |
Net sales | $ 25,803 | $ 72,605
Net income (loss) | $ 5,023 | $ 12,868
Basic earnings per share (in dollars per share) | $ 0.43 | $ 1.11
Diluted earnings per share (in dollars per share) | $ 0.43 | $ 1.11
Pro Forma [Member] |  |
Net sales | $ 184 | $ 552
Net income (loss) | $ (2,817) | $ (10,035)
Basic earnings per share (in dollars per share) | $ (0.24) | $ (0.86)
Diluted earnings per share (in dollars per share) | $ (0.24) | $ (0.86)

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- 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 + Details
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