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Note 11 - Business Segment Information (Detail) - Components of segment performance (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011	Dec. 31, 2011
Revenues	$ 26,181	$ 35,204	$ 72,388	$ 106,231
Segment contribution	1,754	1,545	(2,468)	646
Interest expense, net	(96)	(124)	(312)	(440)
Miscellaneous	(15)	49	17	339
Income taxes-current	(120)	(67)	(387)	(134)
Income taxes-deferred	(55)	(55)	(50)	(164)
Income (Loss) from discontinued operations	200	4	178	(4,174)
Noncontrolling interest	11	11	31	39
Net income (loss) attributable to Ultralife	1,679	1,363	(2,991)	(3,888)
Total assets	95,329	101,347	95,329	101,347	100,815
Battery & Energy Products [Member]
Revenues	16,633	28,834	52,238	84,321
Segment contribution	4,770	7,929	12,476	18,223
Total assets	54,031	54,661	54,031	54,661
Communications Systems [Member]
Revenues	9,548	6,370	20,150	21,910
Segment contribution	3,449	1,431	6,803	7,111
Total assets	32,290	34,001	32,290	34,001
Discontinued Operations [Member]
Income (Loss) from discontinued operations	200	4	178	(4,174)
Total assets	11	2,885	11	2,885
Corporate [Member]
Segment contribution	(6,465)	(7,815)	(21,747)	(24,688)
Interest expense, net	(96)	(124)	(312)	(440)
Miscellaneous	(15)	49	17	339
Income taxes-current	(120)	(67)	(387)	(134)
Income taxes-deferred	(55)	(55)	(50)	(164)
Noncontrolling interest	11	11	31	39
Total assets	$ 8,997	$ 9,800	$ 8,997	$ 9,800

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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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