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Note 4 - Marketable Securities (Details) - Proceeds from Sale of Available-for-Sale Securities and the Resulting Gross Realized Gains (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 30, 2014
Mar. 31, 2013
Mar. 25, 2012
Available-for-sale securities:      
Proceeds $ 2,890 $ 2,000 $ 4,050
Gross realized gains $ 0 $ 0 $ 0