v2.4.0.6
Document and Entity Information (USD $)
6 Months Ended
Jul. 03, 2011
Jul. 31, 2011
Jun. 27, 2010
Document and Entity Information [Abstract]      
Entity Registrant Name ULTRALIFE CORP    
Entity Central Index Key 0000875657    
Document Type 10-Q    
Document Period End Date Jul. 03, 2011    
Amendment Flag false    
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus Q2    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 54,000,000
Entity Common Stock, Shares Outstanding   17,306,150