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Note 6 - Earnings or Loss per Share (Detail) - Basic and Diluted Earnings Per Share (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
NUMERATOR:    
Net income (loss) before allocation of earnings to participating securities $ 13 $ (1,017)
Less: Earnings allocated to participating securities 1  
Net income (loss) after allocation of earnings to participating securities $ 12 $ (1,017)
DENOMINATOR:    
Weighted average number of common shares outstanding - basic (in Shares) 16,231,291 16,038,880
Weighted average number of common shares outstanding - dilutive (in Shares) 16,231,291 16,038,880
Basic income (loss) per common share attributable to Build-A-Bear Workshop, Inc. stockholders: (in Dollars per share) $ 0.00 $ (0.06)
Diluted income (loss) per common share attributable to Build-A-Bear Workshop, Inc. stockholders (in Dollars per share) $ 0.00 $ (0.06)