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Note 4 - Detail of Certain Asset Accounts (Details) - Inventories (USD $)
Dec. 26, 2014
Mar. 31, 2014
Inventories [Abstract]    
Raw material $ 3,031,000us-gaap_InventoryRawMaterialsNetOfReserves $ 3,093,000us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 848,000us-gaap_InventoryWorkInProcessNetOfReserves 954,000us-gaap_InventoryWorkInProcessNetOfReserves
Finished products 1,108,000us-gaap_InventoryFinishedGoodsNetOfReserves 702,000us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories, net $ 4,987,000us-gaap_InventoryNet $ 4,749,000us-gaap_InventoryNet