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Note 3 - Revenue Recognition (Tables)
 6 Months Ended
Jun. 27, 2020
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Thirteen Week
Periods Ended
    
Twenty-Six Week
Periods Ended
  
   
June 27,
2020
    
June 29,
2019
    
June 27,
2020
    
June 29,
2019
  
Engineering:
                                
Time and Material
   $
10,784
     $
13,528
     $
23,611
     $
27,371
  
Fixed Fee
    
3,189
      
5,098
      
4,503
      
10,267
  
Permanent Placement Services
    
65
      
(43
)
    
87
      
-
  
Total Engineering
   $
14,038
     $
18,583
     $
28,201
     $
37,638
  
                                 
Specialty Health Care:
                                
Time and Material
    
10,601
     $
23,140
     $
32,654
     $
47,046
  
Permanent Placement Services
    
83
      
230
      
227
      
494
  
Total Specialty Health Care
   $
10,684
     $
23,370
     $
32,881
     $
47,540
  
                                 
Information Technology:
                                
Time and Material
   $
7,779
     $
8,641
     $
16,336
     $
16,950
  
Permanent Placement Services
    
151
      
111
      
267
      
172
  
Total Information Technology
   $
7,930
     $
8,752
     $
16,603
     $
17,122
  
    $
32,652
     $
50,705
     $
77,685
     $
102,300