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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)

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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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