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Note 6 - Property and Equipment, Net (Tables)
 3 Months Ended
Apr. 01, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
April 1,
    
December 31,
  
   
2017
    
2016
  
                 
Office furniture and equipment
  $
1,392
    $
1,329
 
Computer equipment
   
6,679
     
6,808
 
Survey and field equipment
   
1,600
     
1,426
 
Leasehold improvements
   
1,696
     
1,583
 
     
11,367
     
11,146
 
Accumulated depreciation
   
(4,866
 )    
(4,463
 )
Property and equipment – net
  $
6,501
    $
6,683