Segment Information - Summarized (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017 USD ($)	Jan. 01, 2017 USD ($)	Dec. 31, 2017 USD ($) segment	Jan. 01, 2017 USD ($)
Segment information
Reportable business segments | segment			3
Sales	$ 18,354	$ 27,009	$ 38,304	$ 52,722
Operating costs	21,292	26,169	42,369	50,672
Segment operating income (loss)	(3,922)	(156)	(5,985)	(334)
Interest expense, net	(927)	(1,030)	(1,939)	(2,137)
Loss on extinguishment of debt				(723)
Other income, net	167	837	130	804
Non-operating expense	(760)	(193)	(1,809)	(2,056)
Loss before income taxes	(4,682)	(349)	(7,794)	(2,390)
Corporate
Segment information
Segment operating income (loss)	(984)	(996)	(1,920)	(2,384)
Precision Components Group | Total segments
Segment information
Sales	13,069	20,773	27,402	40,778
Operating costs	15,353	19,531	30,622	38,134
Segment operating income (loss)	(2,284)	1,242	(3,220)	2,644
Stamping Group | Total segments
Segment information
Sales	4,359	5,511	9,112	10,690
Operating costs	4,746	5,431	9,748	10,400
Segment operating income (loss)	(387)	80	(636)	290
3DMT Group | Total segments
Segment information
Sales	926	568	1,790	856
Operating costs	1,193	1,027	1,999	1,713
Segment operating income (loss)	$ (267)	(459)	$ (209)	(857)
Wireless Group | Total segments
Segment information
Sales		157		398
Operating costs		180		425
Segment operating income (loss)		$ (23)		$ (27)