Basis of Presentation and General Information (Gain and Loss Results for Discontinued Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Jan. 01, 2021	Dec. 27, 2019
Cost of service:
Loss from discontinued operations	$ (7)	$ (172)	$ (6)
European REL Working Capital group [Member]
Revenue:
Total revenue			92
Cost of service:
Total cost of service	7	8	45
Selling, general and administrative costs		165	52
Total costs and operating expenses	7	173	97
Loss from discontinued operations before income taxes	(7)	(173)	(5)
Income tax (benefit) expense		(1)	1
Loss from discontinued operations	(7)	(172)	(6)
European REL Working Capital group [Member] | Revenue Before Reimbursements [Member]
Revenue:
Total revenue			75
European REL Working Capital group [Member] | Reimbursements [Member]
Revenue:
Total revenue			17
Cost of service:
Total cost of service			17
European REL Working Capital group [Member] | Cost Before Reimbursements [Member]
Cost of service:
Total cost of service	$ 7	$ 8	$ 28