Document And Entity Information (USD $)
12 Months Ended
Jan. 03, 2015
Mar. 13, 2015
Jun. 28, 2014
Document and Entity Information [Abstract]      
Entity Registrant Name BUILD A BEAR WORKSHOP INC    
Document Type 10-K    
Current Fiscal Year End Date --01-03    
Entity Common Stock, Shares Outstanding   17,412,152  
Entity Public Float     $ 164,615,013
Amendment Flag false    
Entity Central Index Key 0001113809    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Well-known Seasoned Issuer Yes    
Document Period End Date Jan. 03, 2015    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY