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Note 9 - Income Per Share - Computation Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 02, 2019	Nov. 03, 2018	Nov. 02, 2019	Nov. 03, 2018
Net loss before allocation of earnings to participating securities	$ (5,873)	$ (6,064)	$ (5,901)	$ (7,510)
Less: Earnings allocated to participating securities
Net loss	$ (5,873)	$ (6,064)	$ (5,901)	$ (7,510)
Weighted average number of common shares outstanding - basic (in shares)	14,752,307	14,590,614	14,697,592	14,597,255
Dilutive effect of share-based awards: (in shares)
Weighted average number of common shares outstanding - dilutive (in shares)	14,752,307	14,590,614	14,697,592	14,597,255
Basic loss per common share attributable to Build-A-Bear Workshop, Inc. stockholders (in dollars per share)	$ (0.40)	$ (0.42)	$ (0.40)	$ (0.51)
Diluted loss per common share attributable to Build-A-Bear Workshop, Inc. stockholders (in dollars per share)	$ (0.40)	$ (0.42)	$ (0.40)	$ (0.51)

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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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