Basis of Presentation and General Information (Gain and Loss Results for Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Cost of service:
Loss from discontinued operations	$ (51)	$ (151)	$ (6)	$ (85)
European REL Working Capital group [Member]
Revenue:
Total revenue	(17)	1,122	92	2,748
Cost of service:
Total cost of service	(15)	1,084	41	2,311
Selling, general and administrative costs	61	243	56	602
Total costs and operating expenses	46	1,327	97	2,913
Loss from discontinued operations before income taxes	(63)	(205)	(5)	(165)
Income tax expense (benefit)	(12)	(54)	1	(80)
Loss from discontinued operations	(51)	(151)	(6)	(85)
European REL Working Capital group [Member] | Revenue Before Reimbursements [Member]
Revenue:
Total revenue	(17)	908	75	2,344
European REL Working Capital group [Member] | Reimbursements [Member]
Revenue:
Total revenue		214	17	404
Cost of service:
Total cost of service		214	17	404
European REL Working Capital group [Member] | Cost Before Reimbursements [Member]
Cost of service:
Total cost of service	$ (15)	$ 870	$ 24	$ 1,907