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Note 4 - Balance Sheet Details (Details) - Inventories (USD $)
In Thousands, unless otherwise specified
Dec. 28, 2014
Mar. 30, 2014
Inventories [Abstract]    
Work-in-process and raw materials $ 21,177us-gaap_InventoryWorkInProcessAndRawMaterialsNetOfReserves $ 13,555us-gaap_InventoryWorkInProcessAndRawMaterialsNetOfReserves
Finished goods 11,889us-gaap_InventoryFinishedGoodsNetOfReserves 15,427us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventories $ 33,066us-gaap_InventoryNet $ 28,982us-gaap_InventoryNet