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Note 9 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three-Month Period Ended
 
   
March 31,
 2013
   
April 1,
 2012
 
Net Income (Loss) from continuing operations attributable to Ultralife common shareholders (a)
    170       (1,431 )
Effect of Dilutive Securities
    -       -  
Net Income (Loss) from continuing operations attributable to Ultralife common shareholders - Adjusted (b)
  $ 170     $ (1,431 )
                 
Net Income (Loss) from discontinued operations attributable to Ultralife common shareholders (c)
  $ 264     $ (71 )
Effect of Dilutive Securities
    -       -  
Net Income (Loss) from discontinued operations attributable to Ultralife common shareholders - Adjusted (d)
  $ 264     $ (71 )
Average Common Shares Outstanding –
               
Basic (e)
    17,457,000       17,358,000  
Effect of Dilutive Securities:
               
Stock Options / Warrants
    21,000       -  
Average Common Shares Outstanding –
               
Diluted (f)
    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 )