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Note 3 - Inventories (Details) - Components of Inventories (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Dec. 28, 2013
Components of Inventories [Abstract]    
Raw materials $ 29,756us-gaap_InventoryRawMaterialsNetOfReserves $ 28,228us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 15,164us-gaap_InventoryWorkInProcessNetOfReserves 17,576us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 52,471us-gaap_InventoryFinishedGoodsNetOfReserves 46,787us-gaap_InventoryFinishedGoodsNetOfReserves
Total $ 97,391us-gaap_InventoryNet $ 92,591us-gaap_InventoryNet