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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Revenue:      
Total revenue $ 285,887 $ 276,599 $ 279,787
Cost of service:      
Total cost of service 186,285 183,331 186,191
Selling, general and administrative costs (includes $3,238, $3,330 and $3,007 of stock compensation expense in 2018, 2017, and 2016, respectively) 64,123 63,271 60,079
Impairment of assets 6,269    
Acquisition-related contingent consideration (4,364)    
Restructuring cost   1,293  
Total costs and operating expenses 252,313 247,895 246,270
Operating income 33,574 28,704 33,517
Other expense:      
Interest expense (638) (584) (387)
Income from continuing operations before income taxes 32,936 28,120 33,130
Income tax expense 5,577 2,564 12,455
Income from continuing operations 27,359 25,556 20,675
Gain (loss) from discontinued operations (net of taxes) (3,450) 1,798 866
Net income $ 23,909 $ 27,354 $ 21,541
Basic net income per common share:      
Income per common share from continuing operations $ 0.93 $ 0.89 $ 0.71
Income (loss) per common share from discontinued operations (0.12) 0.06 0.03
Net income per common share 0.81 0.95 0.74
Diluted net income per common share:      
Income per common share from continuing operations 0.85 0.79 0.63
Income (loss) per common share from discontinued operations (0.11) 0.06 0.03
Net income per common share $ 0.74 $ 0.85 $ 0.66
Weighted average common shares outstanding 29,378,643 28,852,251 29,082,253
Weighted average common and common equivalent shares outstanding 32,330,406 32,196,132 32,815,391
Revenue Before Reimbursements [Member]      
Revenue:      
Total revenue $ 264,523 $ 255,131 $ 252,096
Reimbursements [Member]      
Revenue:      
Total revenue 21,364 21,468 27,691
Cost of service:      
Total cost of service 21,364 21,468 27,691
Cost Before Reimbursements [Member]      
Cost of service:      
Total cost of service $ 164,921 $ 161,863 $ 158,500