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Note J - Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) (USD $)
Mar. 29, 2015
Mar. 30, 2014
Deferred tax assets    
Accrued expenses $ 145,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities $ 162,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Allowance for doubtful accounts 52,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 49,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Deferred revenue 432,000us-gaap_DeferredTaxAssetsDeferredIncome 569,000us-gaap_DeferredTaxAssetsDeferredIncome
Deferred stock compensation 223,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 594,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Excess of straight line over actual rent 412,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent 289,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent
Investment 152,000us-gaap_DeferredTaxAssetsInvestments 157,000us-gaap_DeferredTaxAssetsInvestments
Other 140,000us-gaap_DeferredTaxAssetsOther 129,000us-gaap_DeferredTaxAssetsOther
Total gross deferred tax assets 1,556,000us-gaap_DeferredTaxAssetsGross 1,949,000us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities    
Deductible prepaid expense 288,000us-gaap_DeferredTaxLiabilitiesPrepaidExpenses 302,000us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Unrealized gain on marketable securities 16,000us-gaap_DeferredTaxLiabilitiesInvestments 83,000us-gaap_DeferredTaxLiabilitiesInvestments
Depreciation expense 1,692,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 1,692,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deductible business interruption expenses 0nath_DeferredTaxLiabilitiesBusinessInterruptionExpense 293,000nath_DeferredTaxLiabilitiesBusinessInterruptionExpense
Amortization 311,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 287,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Total gross deferred tax liabilities 2,307,000us-gaap_DeferredIncomeTaxLiabilities 2,657,000us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax (liability) (751,000)us-gaap_DeferredTaxLiabilities (708,000)us-gaap_DeferredTaxLiabilities
Less current portion (277,000)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent (26,000)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Long-term portion $ (1,028,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent $ (734,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent