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Basis of Presentation and General Information (Gain and Loss Results for Discontinued Operations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2021
Dec. 27, 2019
Dec. 28, 2018
Cost of service:      
Loss from discontinued operations $ (172) $ (6) $ (3,450)
European REL Working Capital group [Member]      
Revenue:      
Total revenue   92 3,015
Cost of service:      
Total cost of service 8 45 5,836
Selling, general and administrative costs 165 52 1,210
Total costs and operating expenses 173 97 7,046
Loss from discontinued operations before income taxes (173) (5) (4,031)
Income tax (benefit) expense (1) 1 (581)
Loss from discontinued operations (172) (6) (3,450)
European REL Working Capital group [Member] | Revenue Before Reimbursements [Member]      
Revenue:      
Total revenue   75 2,519
European REL Working Capital group [Member] | Reimbursements [Member]      
Revenue:      
Total revenue   17 496
Cost of service:      
Total cost of service   17 496
European REL Working Capital group [Member] | Cost Before Reimbursements [Member]      
Cost of service:      
Total cost of service $ 8 $ 28 $ 5,340