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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 04, 2014
Jan. 03, 2014
Public Utilities, Inventory [Line Items]    
Raw materials and purchased parts $ 1,867 $ 1,367
Work-in-process 1,769 913
Finished goods 12,463 11,029
Inventory, Gross 16,099 13,309
Less: inventory reserves 1,167 795
Inventory, Net $ 14,932 $ 12,514