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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, 2019 | Jul. 01, 2018
Revenue | $ 57,074 | $ 58,957
Operating income | 4,171 | 3,046
Net Income attributable to Ultralife Corporation | $ 2,955 | $ 2,851
Basic (in dollars per share) | $ 0.19 | $ 0.18
Diluted (in dollars per share) | $ 0.18 | $ 0.17

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