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Note 9 - Earnings Per Share (Tables) | 6 Months Ended
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Jul. 01, 2012
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three-Month Period Ended |  |  | Six-Month Period Ended |
|  | July 1, 2012 |  |  | July 3, 2011 |  |  | July 1, 2012 |  |  | July 3, 2011 |
Net Income (Loss) from continuing operations attributable to Ultralife |  | $ | (3,216 | ) |  | $ | 2,764 |  |  | $ | (4,647 | ) |  | $ | (1,073 | )
Net Income (Loss) from continuing operations attributable to participating securities (unvested restricted stock awards) (-0-, 2,000, -0- and -0- shares, respectively) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Net Income (Loss) from continuing operations attributable to Ultralife common shareholders (a) |  |  | (3,216 | ) |  |  | 2,764 |  |  |  | (4,647 | ) |  |  | (1,073 | )
Effect of Dilutive Securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Net Income (Loss) from continuing operations attributable to Ultralife common shareholders - Adjusted (b) |  | $ | (3,216 | ) |  | $ | 2,764 |  |  | $ | (4,647 | ) |  | $ | (1,073 | )
Net Income (Loss) from discontinued operations attributable to Ultralife common shareholders (c) |  | $ | 49 |  |  | $ | (2,325 | ) |  | $ | (22 | ) |  | $ | (4,178 | )
Effect of Dilutive Securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Net Income (Loss) from discontinued operations attributable to Ultralife common shareholders - Adjusted (d) |  | $ | 49 |  |  | $ | (2,325 | ) |  | $ | (22 | ) |  | $ | (4,178 | )
Average Common Shares Outstanding – Basic (e) |  |  | 17,396,000 |  |  |  | 17,296,000 |  |  |  | 17,376,000 |  |  |  | 17,286,000 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options / Warrants |  |  | - |  |  |  | 12,000 |  |  |  | - |  |  |  | - |
Average Common Shares Outstanding – Diluted (f) |  |  | 17,396,000 |  |  |  | 17,308,000 |  |  |  | 17,376,000 |  |  |  | 17,286,000 |
EPS – Basic (a/e) - continuing operations |  | $ | (0.18 | ) |  | $ | 0.16 |  |  | $ | (0.27 | ) |  | $ | (0.06 | )
EPS – Basic (c/e) - discontinued operations |  | $ | 0.00 |  |  | $ | (0.13 | ) |  | $ | (0.00 | ) |  | $ | (0.24 | )
EPS – Diluted (b/f) - continuing operations |  | $ | (0.18 | ) |  | $ | 0.16 |  |  | $ | (0.27 | ) |  | $ | (0.06 | )
EPS – Diluted (d/f) - discontinued operations |  | $ | 0.00 |  |  | $ | (0.13 | ) |  | $ | (0.00 | ) |  | $ | (0.24 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration