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Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable (Tables)
 3 Months Ended
Apr. 03, 2021
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
April 3,
2021
    
January 2,
2021
  
Billed
   $
31,529
     $
25,926
  
Accrued and unbilled
    
11,636
      
8,219
  
Work-in-progress
    
3,535
      
3,612
  
Allowance for sales discounts and doubtful accounts
    
(1,418
)
    
(1,750
)
                 
Accounts receivable, net
   $
45,282
     $
36,007