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Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable (Tables)
 9 Months Ended
Sep. 26, 2020
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
September 26,
2020
    
December 28,
2019
  
Billed
   $
20,553
     $
29,214
  
Accrued and unbilled
    
10,424
      
13,824
  
Work-in-progress
    
3,759
      
4,352
  
Accounts receivable subject to arbitration
    
-
      
14,095
  
Allowance for sales discounts and doubtful accounts
    
(1,750
)
    
(1,725
)
                 
Accounts receivable, net
   $
32,986
     $
59,760