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Note 5 - Earnings per Share (Detail) - Basic and Diluted Earnings Per Share (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jul. 02, 2011
Jun. 30, 2012
Jul. 02, 2011
NUMERATOR:        
Net loss before allocation of earnings to participating securities (in Dollars) $ (7,551) $ (6,675) $ (8,568) $ (8,927)
Less: Earnings allocated to participating securities (in Dollars)            
Net loss after allocation of earnings to participating securities (in Dollars) $ (7,551) $ (6,675) $ (8,568) $ (8,927)
DENOMINATOR:        
Weighted average number of common shares outstanding - basic 16,458,889 17,839,349 16,248,884 17,964,763
Dilutive effect of share-based awards:            
Weighted average number of common shares outstanding - dilutive 16,458,889 17,839,349 16,248,884 17,964,763
Basic loss per common share attributable to Build-A-Bear Workshop, Inc. stockholders: (in Dollars per share) $ (0.46) $ (0.37) $ (0.53) $ (0.50)
Diluted loss per common share attributable to Build-A-Bear Workshop, Inc. stockholders (in Dollars per share) $ (0.46) $ (0.37) $ (0.53) $ (0.50)