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Note 2 - Acquisition - Pro Forma Information (Details) - Southwest Electronic Energy Corporation [Member] - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Revenue | $ 54,374 | $ 57,074
Operating income | 3,779 | 4,171
Net income attributable to Ultralife Corporation | $ 2,717 | $ 2,955
Basic (in dollars per share) | $ 0.17 | $ 0.19
Diluted (in dollars per share) | $ 0.17 | $ 0.18

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