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Note 9 - Earnings Per Share (Detail) - Basic and diluted earnings per share (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Jul. 01, 2012
Jul. 03, 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 Ultralife common shareholders (a) (3,216) 2,764 (4,647) (1,073)
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)
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) (in Shares) 17,396,000 17,296,000 17,376,000 17,286,000
Effect of Dilutive Securities:        
Stock Options / Warrants (in Shares) 0 180,177    
Average Common Shares Outstanding – Diluted (f) (in Shares) 17,396,000 17,308,000 17,376,000 17,286,000
EPS – Basic (a/e) - continuing operations (in Dollars per share) $ (0.18) $ 0.16 $ (0.27) $ (0.06)
EPS – Basic (c/e) - discontinued operations (in Dollars per share) $ 0.00 $ (0.13) $ 0.00 $ (0.24)
EPS – Diluted (b/f) - continuing operations (in Dollars per share) $ (0.18) $ 0.16 $ (0.27) $ (0.06)
EPS – Diluted (d/f) - discontinued operations (in Dollars per share) $ 0.00 $ (0.13) $ 0.00 $ (0.24)
Stock Options / Warrants [Member]
        
Effect of Dilutive Securities:        
Stock Options / Warrants (in Shares)   12,000