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Note 2 - Acquisition - Pro Forma Information (Details) - Southwest Electronic Energy Corporation [Member] - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended
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Sep. 30, 2020 | Sep. 29, 2019
Revenue | $ 78,736 | $ 84,567
Operating income | 4,486 | 5,536
Net income attributable to Ultralife Corporation | $ 3,124 | $ 3,900
Basic (in dollars per share) | $ 20 | $ 25
Diluted (in dollars per share) | $ 19 | $ 24

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