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Quarterly Financial Information (Unaudited Supplemental Quarterly Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jan. 01, 2021
Sep. 25, 2020
Jun. 26, 2020
Mar. 27, 2020
Dec. 27, 2019
Sep. 27, 2019
Jun. 28, 2019
Mar. 29, 2019
Jan. 01, 2021
Jan. 01, 2021
Dec. 27, 2019
Dec. 28, 2018
Revenue from continuing operations before reimbursement                 $ 239,482   $ 282,472 $ 285,887
Operating income (loss) $ 1,485 $ 4,527 $ (5,078) $ 7,708 $ 3,593 $ 9,396 $ 9,759 $ 8,590 8,642   31,338 33,574
Income (loss) from continuing operations 900 3,143 (3,933) 5,535 2,287 6,907 7,040 7,049        
Income (loss) from discontinued operations (7) (157)   (8) (2) 2 (51) 45        
Net income $ 893 $ 2,986 $ (3,933) $ 5,527 $ 2,285 $ 6,909 $ 6,989 $ 7,094 $ 5,473   $ 23,277 $ 23,909
Basic net income per common share:                        
Income (loss) per common share from continuing operations $ 0.03 $ 0.11 $ (0.13) $ 0.19 $ 0.08 $ 0.23 $ 0.23 $ 0.24 $ 0.19   $ 0.78 $ 0.93
Loss per common share from discontinued operations   (0.01)             (0.01)   0.00 (0.12)
Basic net income per common share 0.03 0.10 (0.13) 0.19 0.08 0.23 0.23 0.24 0.18   0.78 0.81
Diluted net income per common share:                        
Income (loss) per common share from continuing operations 0.03 0.10 (0.13) 0.17 0.07 0.21 0.22 0.22 0.17   0.72 0.85
Loss per common share from discontinued operations   (0.01)             0.00   0.00 (0.11)
Diluted net income per common share $ 0.03 $ 0.09 $ (0.13) $ 0.17 $ 0.07 $ 0.21 $ 0.22 $ 0.22 $ 0.17   $ 0.72 $ 0.74
Revenue Before Reimbursements [Member]                        
Revenue from continuing operations before reimbursement $ 59,223 $ 57,769 $ 52,632 $ 65,186 $ 63,736 $ 66,755 $ 67,976 $ 62,370 $ 234,810 $ 234,810 $ 260,837 $ 264,523