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Note 1 - Summary of Operations and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Allowance for Credit Losses on Financing Receivables [Table Text Block]
   
2012
   
2011
 
             
Balance at beginning of year
  $ 683     $ 490  
Amounts charged (credited) to expense
    9       237  
Amounts credited to other accounts
    -       (2 )
Uncollectible accounts written-off, net of recovery
    (370 )     (42 )
Balance at end of year
  $ 322     $ 683  
Property, Plant and Equipment, Estimated Useful Lives
 
Buildings 
10 – 20 years
 
Machinery and Equipment
5 – 10 years
 
Furniture and Fixtures
3 – 10 years
 
Computer Hardware and Software
3 – 5 years
 
Leasehold Improvements
Lesser of useful life or lease term
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Years Ended December 31,
 
             
   
2012
   
2011
 
Net Income (Loss) from continuing operations attributable to Ultralife
  $ (1,097 )   $ 1,607  
Net Income (Loss) from continuing operations attributable to participating securities (unvested restricted stock awards) (-0- and 3,000 shares, respectively)
    -       -  
Net Income (Loss) from continuing operations attributable to Ultralife common shareholders (a)
    (1,097 )     1,607  
                 
Net Income (Loss) from discontinued operations attributable to Ultralife common shareholders (c)
  $ (501 )   $ (3,687 )
                 
                 
Average Common Shares Outstanding – Basic (e)
    17,403       17,304  
Effect of Dilutive Securities:
               
     Stock Options / Warrants
    -       32  
Average Common Shares Outstanding – Diluted (f)
    17,403       17,336  
                 
EPS – Basic (a/e) – continuing operations
  $ (0.06 )   $ 0.09  
EPS – Basic (c/e) – discontinued operations
  $ (0.03 )   $ (0.21 )
EPS – Diluted (b/f) – continuing operations
  $ (0.06 )   $ 0.09  
EPS – Diluted (d/f) – discontinued operations
  $ (0.03 )   $ (0.21 )