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Note 12 - Business Segment Information - Segment Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Revenues	$ 23,069	$ 22,035
Segment Contribution	2,356	1,841
Interest, Financing and Miscellaneous Expense, Net	(133)	(93)
Tax Provision	(55)	(87)
Non-Controlling Interest	(17)	(6)
Net Income Attributable to Ultralife	2,151	1,655
Battery & Energy Products Segment [Member]
Revenues	17,224	17,479
Segment Contribution	5,036	4,930
Communications Systems Segment [Member]
Revenues	5,845	4,556
Segment Contribution	2,246	1,960
Corporate Segment [Member]
Revenues
Segment Contribution	(4,926)	(5,049)
Interest, Financing and Miscellaneous Expense, Net	(133)	(93)
Tax Provision	(55)	(87)
Non-Controlling Interest	$ (17)	$ (6)

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