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Note 7 - Income Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Thirteen weeks ended
    
Thirty-nine weeks ended
  
   
September 30,
2017
    
October 1,
2016
    
September 30,
2017
    
October 1,
2016
  
                                 
NUMERATOR:
                                
Net income before allocation of earnings to participating securities
  $
1,441
     $
1,841
     $
2,673
     $
1,058
  
Less: Earnings allocated to participating securities
   
11
      
39
      
33
      
22
  
Net income after allocation of earnings to participating securities
  $
1,430
     $
1,802
     $
2,640
     $
1,036
  
                                 
DENOMINATOR:
                                
Weighted average number of common shares outstanding - basic
   
15,633,290
      
15,518,115
      
15,600,184
      
15,471,759
  
Dilutive effect of share-based awards:
   
182,975
      
172,889
      
189,667
      
178,384
  
Weighted average number of common shares outstanding - dilutive
   
15,816,265
      
15,691,004
      
15,789,851
      
15,650,143
  
Basic income per common share attributable to Build-A-Bear Workshop, Inc. stockholders:
  $
0.09
     $
0.12
     $
0.17
     $
0.07
  
Diluted income per common share attributable to Build-A-Bear Workshop, Inc. stockholders
  $
0.09
     $
0.11
     $
0.17
     $
0.07