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Note 11 - Business Segment Information (Details) - Components of segment performance (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jul. 01, 2012 | Jun. 30, 2013 | Jul. 01, 2012 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 17,279 | $ 18,706 | $ 38,298 | $ 46,207 |
Segment contribution | (1,874) | (2,932) | (1,499) | (4,221) |
Interest expense, net | (31) | (113) | (119) | (216) |
Miscellaneous | 2 | (20) | (23) | 32 |
Income taxes-current | (23) | (188) | (61) | (267) |
Income taxes-deferred | (30) | 17 | (90) | 5 |
Income (Loss) from discontinued operations | (120) | 49 | 144 | (22) |
Noncontrolling interest | 3 | 20 | 9 | 20 |
Net loss attributable to Ultralife | (2,073) | (3,167) | (1,639) | (4,669) |
Total assets | 91,135 | 92,991 | 91,135 | 92,991 | 97,718
Battery & Energy Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 14,656 | 15,523 | 27,709 | 35,605 |
Segment contribution | 3,490 | 3,763 | 6,590 | 7,706 |
Total assets | 44,357 | 51,477 | 44,357 | 51,477 |
Communications Systems [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 2,623 | 3,183 | 10,589 | 10,602 |
Segment contribution | 1,032 | 704 | 4,311 | 3,354 |
Total assets | 31,711 | 30,548 | 31,711 | 30,548 |
Discontinued Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income (Loss) from discontinued operations | (120) | 49 | 144 | (22) |
Total assets |  | 2,759 |  | 2,759 |
Corporate Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment contribution | (6,396) | (7,399) | (12,400) | (15,281) |
Interest expense, net | (31) | (113) | (119) | (216) |
Miscellaneous | 2 | (20) | (23) | 32 |
Income taxes-current | (23) | (188) | (61) | (267) |
Income taxes-deferred | (30) | 17 | (90) | 5 |
Noncontrolling interest | 3 | 20 | 9 | 20 |
Total assets | $ 15,067 | $ 8,207 | $ 15,067 | $ 8,207 |

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