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Note 8 - Inventory Components (Details) - USD ($)
Apr. 03, 2016
Dec. 31, 2015
Apr. 03, 2015
Raw materials   $ 12,388,000 $ 12,638,000
Work in process   10,366,000 10,718,000
Finished goods   3,167,000 3,060,000
Reserve for excess and obsolete inventory   (5,729,000) (5,621,000)
Total $ 20,795,000 $ 20,192,000 $ 20,795,000