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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		6 Months Ended
	Aug. 01, 2020	Aug. 03, 2019	Aug. 01, 2020	Aug. 03, 2019
Net (loss) income before allocation of earnings to participating securities	$ (13,909)	$ (1,224)	$ (35,113)	$ (28)
Less: Earnings allocated to participating securities	0	0	0	0
Net (loss) income	$ (13,909)	$ (1,224)	$ (35,113)	$ (28)
Weighted average number of common shares outstanding - basic (in shares)	14,999,786	14,726,678	14,936,541	14,669,626
Dilutive effect of share-based awards: (in shares)	0	0	0	0
Weighted average number of common shares outstanding - dilutive (in shares)	14,999,786	14,726,678	14,936,541	14,669,626
Basic (loss) income per common share attributable to Build-A-Bear Workshop, Inc. stockholders (in dollars per share)	$ (0.93)	$ (0.08)	$ (2.35)	$ (0.00)
Diluted (loss) income per common share attributable to Build-A-Bear Workshop, Inc. stockholders (in dollars per share)	$ (0.93)	$ (0.08)	$ (2.35)	$ (0.00)

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