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Note 11 - Business Segment Information - Segment Activity (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Revenues	[1]	$ 27,493	$ 20,330	$ 75,772	$ 66,263
Segment contribution		1,306	1,500	4,896	5,488
Other expense		(160)	21	(301)	(27)
Tax provision		(225)	(86)	(942)	(219)
Non-controlling interest		(23)	(27)	(74)	(57)
Net income attributable to Ultralife		898	1,408	3,579	5,185
Other income		(160)	21	(301)	(27)
Other expense		(160)	21	(301)	(27)
Battery & Energy Products Segment [Member]
Revenues	[1]	22,578	17,289	58,876	52,344
Segment contribution		6,117	4,702	16,182	14,664
Other expense
Other income
Other expense
Communications Systems Segment [Member]
Revenues	[1]	4,915	3,041	16,896	13,919
Segment contribution		1,744	1,339	5,628	5,209
Other expense
Other income
Other expense
Corporate Segment [Member]
Revenues
Segment contribution		(6,555)	(4,541)	(16,914)	(14,385)
Other expense		(160)	21	(301)	(27)
Tax provision		(225)	(86)	(942)	(219)
Non-controlling interest		(23)	(27)	(74)	(57)
Other income		(160)	21	(301)	(27)
Other expense		$ (160)	$ 21	$ (301)	$ (27)
[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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