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Note 3 - Revenue Recognition (Tables)
 9 Months Ended
Sep. 26, 2020
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Thirteen Week
Periods Ended
    
Thirty-Nine Week
Periods Ended
  
   
September 26,
2020
    
September 28,
2019
    
September 26,
2020
    
September 28,
2019
  
Engineering:
                                
Time and Material
   $
10,369
     $
13,938
     $
33,980
     $
41,309
  
Fixed Fee
    
4,660
      
1,202
      
9,163
      
11,469
  
Permanent Placement Services
    
58
      
-
      
145
      
-
  
Total Engineering
   $
15,087
     $
15,140
     $
43,288
     $
52,778
  
                                 
Specialty Health Care:
                                
Time and Material
   $
8,844
     $
16,272
     $
41,498
     $
63,318
  
Permanent Placement Services
    
171
      
493
      
398
      
987
  
Total Specialty Health Care
   $
9,015
     $
16,765
     $
41,896
     $
64,305
  
                                 
Information Technology:
                                
Time and Material
   $
7,347
     $
8,134
     $
23,683
     $
25,084
  
Permanent Placement Services
    
112
      
211
      
379
      
383
  
Total Information Technology
   $
7,459
     $
8,345
     $
24,062
     $
25,467
  
    $
31,561
     $
40,250
     $
109,246
     $
142,550