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Note 2 - Acquisition - Pro Forma Information (Details) - Southwest Electronic Energy Corporation [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Revenue | $ 107,712 | $ 115,590
Operating income | 5,701 | 8,008
Net Income attributable to Ultralife Corporation | $ 5,232 | $ 5,526
Basic (in dollars per share) | $ 0.33 | $ 0.35
Diluted (in dollars per share) | $ 0.33 | $ 0.34

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