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Note 6 - Loss per Share (Details) - Basic and Diluted Earnings Per Share (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
NUMERATOR:        
Net loss before allocation of earnings to participating securities (in Dollars) $ (1,354) $ (4,252) $ (7,559) $ (12,820)
Net loss after allocation of earnings to participating securities (in Dollars) $ (1,354) $ (4,252) $ (7,559) $ (12,820)
DENOMINATOR:        
Weighted average number of common shares outstanding - basic 16,531,240 16,473,114 16,407,668 16,323,630
Weighted average number of common shares outstanding - dilutive 16,531,240 16,473,114 16,407,668 16,323,630
Basic loss per common share attributable to Build-A-Bear Workshop, Inc. stockholders: (in Dollars per share) $ (0.08) $ (0.26) $ (0.46) $ (0.79)
Diluted loss per common share attributable to Build-A-Bear Workshop, Inc. stockholders (in Dollars per share) $ (0.08) $ (0.26) $ (0.46) $ (0.79)