Document And Entity Information
9 Months Ended
Sep. 29, 2012
Nov. 06, 2012
Document and Entity Information [Abstract]    
Entity Registrant Name BUILD A BEAR WORKSHOP INC  
Document Type 10-Q  
Current Fiscal Year End Date --12-29  
Entity Common Stock, Shares Outstanding   17,281,699
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 No  
Document Period End Date Sep. 29, 2012  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q3