v3.10.0.1
Document And Entity Information - shares
6 Months Ended
Aug. 04, 2018
Sep. 06, 2018
Document Information [Line Items]    
Entity Registrant Name BUILD A BEAR WORKSHOP INC  
Entity Central Index Key 0001113809  
Trading Symbol bbw  
Current Fiscal Year End Date --02-02  
Entity Filer Category Accelerated Filer  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer No  
Entity Common Stock, Shares Outstanding (in shares)   14,971,775
Document Type 10-Q  
Document Period End Date Aug. 04, 2018  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Amendment Flag false