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Note 12 - Business Segment Information - Segment Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Revenues	$ 22,864	$ 19,939	$ 45,933	$ 41,974
Segment Contribution	1,632	1,322	3,988	3,163
Income, Net	86	(49)	(48)	(142)
Tax Provision	(78)	(179)	(133)	(266)
Non-Controlling Interest	(13)		(30)	(6)
Net Income Attributable to Ultralife	1,627	1,094	3,777	2,749
Battery & Energy Products Segment [Member]
Revenues	17,831	16,880	35,055	34,359
Segment Contribution	4,926	4,741	9,962	9,671
Communications Systems Segment [Member]
Revenues	5,033	3,059	10,878	7,615
Segment Contribution	1,624	1,480	3,870	3,440
Corporate Segment [Member]
Revenues
Segment Contribution	(4,918)	(4,899)	(9,844)	(9,948)
Income, Net	86	(49)	(48)	(142)
Tax Provision	(78)	(179)	(133)	(266)
Non-Controlling Interest	$ (13)		$ (30)	$ (6)

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