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Note 11 - Earnings Per Share (Details) - Computation Basic and Diluted Earnings Per Common Share (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
NUMERATOR:
Net income (loss) before allocation of earnings to participating securities	$ 14,362us-gaap_NetIncomeLoss	$ (2,112)us-gaap_NetIncomeLoss	$ (49,295)us-gaap_NetIncomeLoss
Less: Earnings allocated to participating securities	439us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted
Net income (loss)	$ 13,923us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (2,112)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (49,295)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
DENOMINATOR:
Weighted average number of common shares outstanding - basic	16,908,001us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	16,465,138us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	16,331,672us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of share-based awards:	225,810us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average number of common shares outstanding - dilutive	17,133,811us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	16,465,138us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	16,331,672us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic income (loss) per common share attributable to Build-A-Bear Workshop, Inc. stockholders	$ 0.82us-gaap_EarningsPerShareBasic	$ (0.13)us-gaap_EarningsPerShareBasic	$ (3.02)us-gaap_EarningsPerShareBasic
Diluted income (loss) per common share attributable to Build-A-Bear Workshop, Inc. stockholders	$ 0.81us-gaap_EarningsPerShareDiluted	$ (0.13)us-gaap_EarningsPerShareDiluted	$ (3.02)us-gaap_EarningsPerShareDiluted

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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