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Note 1 - Summary of Operations and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Allowance for Credit Losses on Financing Receivables [Table Text Block]
   
2013
   
2012
 
             
Balance at beginning of year
  $ 322     $ 683  
Amounts charged to expense
    29       9  
Uncollectible accounts written-off, net of recovery
    (63 )     (370 )
Balance at end of year
  $ 288     $ 322  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Years Ended December 31,
 
   
2013
   
2012
 
Net Loss from continuing operations attributable to Ultralife
  $ (1,054 )   $ (1,097 )
Net Loss from continuing operations attributable to participating securities (unvested restricted stock awards) (120,000 and -0- shares, respectively)
    -       -  
Net Loss from continuing operations attributable to Ultralife common shareholders (a)
    (1,054 )     (1,097 )
                 
Net Income (Loss) from discontinued operations attributable to Ultralife common shareholders (c)
  $ 128     $ (501 )
                 
Average Common Shares Outstanding – Basic (e)
    17,465,000       17,403,000  
Effect of Dilutive Securities:
               
     Stock Options / Warrants
    -       -  
Average Common Shares Outstanding – Diluted (f)
    17,465,000       17,403,000  
                 
EPS – Basic (a/e) – continuing operations
  $ (0.06 )   $ (0.06 )
EPS – Basic (c/e) – discontinued operations
  $ 0.01     $ (0.03 )
EPS – Diluted (b/f) – continuing operations
  $ (0.06 )   $ (0.06 )
EPS – Diluted (d/f) – discontinued operations
  $ 0.01     $ (0.03 )