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Note 11 - Business Segment Information (Detail) - Components of segment performance (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Dec. 31, 2012
Revenues	$ 21,019	$ 27,501
Segment contribution	375	(1,289)
Interest expense, net	(88)	(103)
Miscellaneous	(25)	52
Income taxes-current	(38)	(79)
Income taxes-deferred	(60)	(12)
Income (Loss) from discontinued operations	264	(71)
Noncontrolling interest	6
Net income (loss) attributable to Ultralife	434	(1,502)
Total assets	92,242	94,664	97,718
Battery & Energy Products [Member]
Revenues	13,053	20,082
Segment contribution	3,100	3,943
Total assets	47,742	51,597
Communications Systems [Member]
Revenues	7,966	7,419
Segment contribution	3,279	2,650
Total assets	32,645	30,524
Discontinued Operations [Member]
Income (Loss) from discontinued operations	264	(71)
Total assets		3,125
Corporate [Member]
Segment contribution	(6,004)	(7,882)
Interest expense, net	(88)	(103)
Miscellaneous	(25)	52
Income taxes-current	(38)	(79)
Income taxes-deferred	(60)	(12)
Noncontrolling interest	6
Total assets	$ 11,855	$ 9,418

X

- 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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