v2.4.0.6
Document and Entity Information
3 Months Ended
Apr. 01, 2012
Apr. 29, 2012
Document and Entity Information [Abstract]    
Entity Registrant Name ULTRALIFE CORP  
Entity Central Index Key 0000875657  
Document Type 10-Q  
Document Period End Date Apr. 01, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   17,388,435