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Note 5 - Accounts Receivable, Net (Tables)
 3 Months Ended
Apr. 01, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
April 1,
    
December 31,
  
   
2017
    
2016
  
                 
Billed
  $
47,267
    $
53,756
 
Unbilled
   
27,261
     
23,237
 
Contract retentions
   
523
     
510
 
                 
     
75,051
     
77,503
 
Less: allowance for doubtful accounts
   
(1,896
 )    
(1,992
 )
Accounts receivable, net
  $
73,155
    $
75,511