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Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable (Tables)
6 Months Ended
Jun. 29, 2019
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
June 29,
2019
   
December 29,
2018
 
Billed
  $
32,270
    $
32,323
 
Accrued and unbilled
   
12,620
     
10,383
 
Work-in-progress
   
3,628
     
2,252
 
Accounts receivable subject to arbitration
   
11,204
     
8,820
 
Allowance for sales discounts and doubtful accounts
   
(1,492
)
   
(1,443
)
                 
Accounts receivable, net
  $
58,230
    $
52,335