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Note 7 - (Loss) Income Per Share - Computation Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Net (loss) income before allocation of earnings to participating securities	$ (1,533)	$ (4,301)	$ 1,232	$ (783)
Less: Earnings allocated to participating securities			18
Net (loss) income after allocation of earnings to participating securities	$ (1,533)	$ (4,301)	$ 1,214	$ (783)
Weighted average number of common shares outstanding - basic (in shares)	15,627,324	15,486,462	15,583,631	15,448,580
Dilutive effect of share-based awards: (in shares)			189,420
Weighted average number of common shares outstanding - dilutive (in shares)	15,627,324	15,486,462	15,773,051	15,448,580
Basic (loss) income per common share attributable to Build-A-Bear Workshop, Inc. stockholders: (in dollars per share)	$ (0.10)	$ (0.28)	$ 0.08	$ (0.05)
Diluted (loss) income per common share attributable to Build-A-Bear Workshop, Inc. stockholders (in dollars per share)	$ (0.10)	$ (0.28)	$ 0.08	$ (0.05)

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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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