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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 9 Months Ended
Sep. 30, 2012
Oct. 02, 2011
Sep. 30, 2012
Oct. 02, 2011
Net Income (Loss) from continuing operations attributable to Ultralife $ 1,479 $ 1,359 $ (3,169) $ 286
Net Income (Loss) from continuing operations attributable to Ultralife common shareholders (a) 1,479 1,359 (3,169) 286
Net Income (Loss) from continuing operations attributable to Ultralife common shareholders - Adjusted (b) 1,479 1,359 (3,169) 286
Net Income (Loss) from discontinued operations attributable to Ultralife common shareholders (c) 200 4 178 (4,174)
Net Income (Loss) from discontinued operations attributable to Ultralife common shareholders - Adjusted (d) $ 200 $ 4 $ 178 $ (4,174)
Average Common Shares Outstanding – Basic (e) (in Shares) 17,418,000 17,313,000 17,390,000 17,295,000
Effect of Dilutive Securities:        
Stock Options / Warrants (in Shares) 0 259,552    
Average Common Shares Outstanding – Diluted (f) (in Shares) 17,418,000 17,341,000 17,390,000 17,295,000
EPS – Basic (a/e) - continuing operations (in Dollars per share) $ 0.09 $ 0.08 $ (0.18) $ 0.02
EPS – Basic (c/e) - discontinued operations (in Dollars per share) $ 0.01 $ 0.00 $ 0.01 $ (0.24)
EPS – Diluted (b/f) - continuing operations (in Dollars per share) $ 0.09 $ 0.08 $ (0.18) $ 0.02
EPS – Diluted (d/f) - discontinued operations (in Dollars per share) $ 0.01 $ 0.00 $ 0.01 $ (0.24)
Stock Options / Warrants [Member]
        
Effect of Dilutive Securities:        
Stock Options / Warrants (in Shares)   28,000