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Note 4 - Inventories (Detail) - USD ($)
$ in Thousands
Mar. 27, 2016
Dec. 31, 2015
Inventory, Net [Abstract]    
Raw materials $ 13,369 $ 11,602
Work in process 2,363 1,560
Finished products 11,248 10,652
Total $ 26,980 $ 23,814