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Note 8 - Income Taxes (Details) - Temporary Differences That Gave Rise to Deferred Tax Assets and Liabilities (USD $)
In Thousands, unless otherwise specified
Jan. 03, 2015
Dec. 28, 2013
Deferred tax assets:    
Deferred revenue $ 4,833us-gaap_DeferredTaxAssetsDeferredIncome $ 4,516us-gaap_DeferredTaxAssetsDeferredIncome
Accrued rents 1,746us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent 1,682us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent
Net operating loss carryforwards 613us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 6,462us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Intangible assets 1,489us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 1,639us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Deferred compensation 1,019us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 2,040us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Accrued compensation 3,058us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 283us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Carryforward of tax credits 4,250us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 5,453us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Receivable write-offs 1,436us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 624us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Stock compensation   179us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Inventories 661us-gaap_DeferredTaxAssetsInventory 414us-gaap_DeferredTaxAssetsInventory
Other 3,270us-gaap_DeferredTaxAssetsOther 1,858us-gaap_DeferredTaxAssetsOther
22,375us-gaap_DeferredTaxAssetsGross 25,150us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance 15,572us-gaap_DeferredTaxAssetsValuationAllowance 20,987us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 6,803us-gaap_DeferredTaxAssetsNet 4,163us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Depreciation (1,021)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (184)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other (2,975)us-gaap_DeferredTaxLiabilitiesOther (3,106)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (3,996)us-gaap_DeferredIncomeTaxLiabilities (3,290)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset $ 2,807us-gaap_DeferredTaxAssetsLiabilitiesNet $ 873us-gaap_DeferredTaxAssetsLiabilitiesNet