Inventories (Details) (USD $) In Thousands, unless otherwise specified	Apr. 04, 2014	Jan. 03, 2014
Public Utilities, Inventory [Line Items]
Raw materials and purchased parts	$ 1,281	$ 1,367
Work-in-process	1,032	913
Finished goods	12,448	11,029
Inventory, Gross	14,761	13,309
Less: inventory reserves	976	795
Inventory, Net	$ 13,785	$ 12,514