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Note E - Marketable Securities - Marketable Securities (Details) (USD $)
Dec. 28, 2014
Mar. 30, 2014
Cost $ 6,718,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis $ 10,947,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Gross Unrealized Gains 101,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 240,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized Losses 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Fair Market Value $ 6,819,000us-gaap_AvailableForSaleSecurities $ 11,187,000us-gaap_AvailableForSaleSecurities