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Note 2 - Acquisition - Pro Forma Information (Details) - UEHC [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Revenue | $ 118,467 | $ 125,826
Operating income | 1,450 | 4,489
Net Income attributable to Ultralife Corporation | $ 1,367 | $ 4,081
Basic (in dollars per share) | $ 9 | $ 26
Diluted (in dollars per share) | $ 8 | $ 25

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