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Note 11 - Net Income (Loss) Per Share - Computation Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Feb. 02, 2019	Dec. 30, 2017
Net income (loss) before allocation of earnings to participating securities	$ (845)	$ (760)	$ (17,933)	$ 7,916
Less: Earnings allocated to participating securities				96
Net income (loss)	$ (845)		$ (17,933)	$ 7,820
Weighted average number of common shares outstanding - basic (in shares)	14,860,511		14,591,270	15,572,045
Dilutive effect of share-based awards: (in shares)				185,015
Weighted average number of common shares outstanding - dilutive (in shares)	14,860,511		14,591,270	15,757,060
Basic income (loss) per common share attributable to Build-A-Bear Workshop, Inc. stockholders (in dollars per share)	$ (0.06)		$ (1.23)	$ 0.50
Diluted income (loss) per common share attributable to Build-A-Bear Workshop, Inc. stockholders (in dollars per share)	$ (0.06)		$ (1.23)	$ 0.50

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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