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Note 12 - Business Segment Information - Segment Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016	Dec. 31, 2016
Revenues	$ 21,047	$ 19,631	$ 63,022	$ 60,835
Segment Contribution	1,263	1,138	4,426	2,119
Interest, Financing and Miscellaneous Expense, Net	(58)	(30)	(200)	(167)
Tax Provision	(104)	(92)	(370)	(213)
Non-Controlling Interest	(3)	3	(8)	25
Net Income Attributable to Ultralife	1,098	1,019	3,848	1,764
Total Assets	93,341	83,557	93,341	83,557	$ 84,744
Battery & Energy Products Segment [Member]
Revenues	18,616	14,943	52,977	47,142
Segment Contribution	5,186	4,522	14,858	14,404
Total Assets	45,221	42,394	45,221	42,394
Communications Systems Segment [Member]
Revenues	2,431	4,688	10,045	13,693
Segment Contribution	1,069	1,475	4,508	3,898
Total Assets	31,465	32,129	31,465	32,129
Corporate Segment [Member]
Segment Contribution	(4,992)	(4,859)	(14,940)	(16,183)
Interest, Financing and Miscellaneous Expense, Net	(58)	(30)	(200)	(167)
Tax Provision	(104)	(92)	(370)	(213)
Non-Controlling Interest	(3)	3	(8)	25
Total Assets	$ 16,655	$ 9,034	$ 16,655	$ 9,034

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