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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
Mar. 31, 2013
Apr. 01, 2012
Net Income (Loss) from continuing operations attributable to Ultralife common shareholders (a) (in Dollars) $ 170 $ (1,431)
Net Income (Loss) from continuing operations attributable to Ultralife common shareholders - Adjusted (b) (in Dollars) 170 (1,431)
Net Income (Loss) from discontinued operations attributable to Ultralife common shareholders (c) (in Dollars) 264 (71)
Net Income (Loss) from discontinued operations attributable to Ultralife common shareholders - Adjusted (d) (in Dollars) $ 264 $ (71)
Basic (e) (in Shares) 17,457,000 17,358,000
Effect of Dilutive Securities:    
Stock Options / Warrants (in Shares) 21,000  
Average Common Shares Outstanding –    
Diluted (f) (in Shares) 17,478,000 17,358,000
EPS – Basic (a/e) - continuing operations $ 0.01 $ (0.08)
EPS – Basic (c/e) - discontinued operations $ 0.02 $ (0.01)
EPS – Diluted (b/f) - continuing operations $ 0.01 $ (0.08)
EPS – Diluted (d/f) - discontinued operations $ 0.02 $ (0.01)