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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
	Oct. 31, 2020	Nov. 02, 2019	Oct. 31, 2020	Nov. 02, 2019
Net income (loss)	$ 1,660	$ (5,873)	$ (33,453)	$ (5,901)
Weighted average number of common shares outstanding - basic (in shares)	14,999,786	14,752,307	14,923,304	14,697,592
Dilutive effect of share-based awards: (in shares)	220,646	0	0	0
Weighted average number of common shares outstanding - dilutive (in shares)	15,220,432	14,752,307	14,923,304	14,697,592
Basic income (loss) per common share attributable to Build-A-Bear Workshop, Inc. stockholders (in dollars per share)	$ 0.11	$ (0.40)	$ (2.24)	$ (0.40)
Diluted income (loss) per common share attributable to Build-A-Bear Workshop, Inc. stockholders (in dollars per share)	$ 0.11	$ (0.40)	$ (2.24)	$ (0.40)

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