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Note 11 - Business Segment Information - Segment Activity (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Apr. 01, 2018
Revenues	[1]	$ 18,882	$ 23,069
Segment Contribution		548	2,356
Other Expense		(58)	(133)
Tax Provision		(41)	(55)
Non-Controlling Interest		(24)	(17)
Net Income Attributable to Ultralife		425	2,151
Battery & Energy Products Segment [Member]
Revenues	[1]	15,998	17,224
Segment Contribution		4,410	5,036
Communications Systems Segment [Member]
Revenues	[1]	2,884	5,845
Segment Contribution		674	2,246
Corporate Segment [Member]
Revenues
Segment Contribution		(4,536)	(4,926)
Other Expense		(58)	(133)
Tax Provision		(41)	(55)
Non-Controlling Interest		$ (24)	$ (17)
[1] Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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