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Note 3 - Fair Values of Assets and Liabilities (Details) (USD $)
12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Note 3 - Fair Values of Assets and Liabilities (Details) [Line Items]      
Cost-method Investments, Other than Temporary Impairment $ 600,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment $ 600,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment $ 0us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
Equity Investments and Promissory Notes Receivable [Member]      
Note 3 - Fair Values of Assets and Liabilities (Details) [Line Items]      
Investment Owned, at Cost $ 3,300,000us-gaap_InvestmentOwnedAtCost
/ us-gaap_InvestmentTypeAxis
= sigm_EquityInvestmentsAndPromissoryNotesReceivableMember