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Note 11 - Business Segment Information (Detail) - Components of segment performance (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011	Dec. 31, 2011
Revenues	$ 18,706	$ 43,112	$ 46,207	$ 71,027
Segment contribution	(2,932)	3,037	(4,221)	(899)
Interest expense, net	(113)	(161)	(216)	(316)
Miscellaneous	(20)	(9)	32	290
Income taxes-current	(188)	(63)	(267)	(67)
Income taxes-deferred	17	(55)	5	(109)
Income (loss) from discontinued operations	49	(2,325)	(22)	(4,178)
Noncontrolling interest	20	15	20	28
Net income (loss) attributable to Ultralife	(3,167)	439	(4,669)	(5,251)
Total assets	92,991	102,439	92,991	102,439	100,815
Battery & Energy Products [Member]
Revenues	15,523	31,239	35,605	55,487
Segment contribution	3,763	7,253	7,706	10,294
Total assets	51,477	56,541	51,477	56,541
Communications Systems [Member]
Revenues	3,183	11,873	10,602	15,540
Segment contribution	704	4,307	3,354	5,680
Total assets	30,548	33,329	30,548	33,329
Discontinued Operations [Member]
Income (loss) from discontinued operations	49	(2,325)	(22)	(4,178)
Total assets	2,759	3,772	2,759	3,772
Corporate [Member]
Segment contribution	(7,399)	(8,523)	(15,281)	(16,873)
Interest expense, net	(113)	(161)	(216)	(316)
Miscellaneous	(20)	(9)	32	290
Income taxes-current	(188)	(63)	(267)	(67)
Income taxes-deferred	17	(55)	5	(109)
Noncontrolling interest	20	15	20	28
Total assets	$ 8,207	$ 8,797	$ 8,207	$ 8,797

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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