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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
	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

X

- Definition

The pro forma operating income (loss) for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Section 50
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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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+ References

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