Goodwill and Other Intangible Assets (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 27, 2015	Dec. 26, 2015
Changes in goodwill
Balance at the beginning of the period		$ 5,600,000
Currency translation and other adjustments		(100,000)
Balance at the end of the period	$ 5,600,000	5,500,000
Impairment charges	0
Commercial Lasers
Changes in goodwill
Balance at the beginning of the period		5,600,000
Currency translation and other adjustments		(100,000)
Balance at the end of the period	$ 5,600,000	$ 5,500,000