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Detail of Certain Balance Sheet Accounts (Tables)
12 Months Ended
Dec. 26, 2020
Balance Sheet Related Disclosures [Abstract]  
Trade receivables
    2020     2019      
Amounts billed  $5,050   $5,523 
Amounts unbilled   1,455    5,576 
Retainage   1,670    572 
Less: Allowance for uncollectible accounts   (386)   (236)
Trade receivables, net  $7,789   $11,435 
Prepaid expenses and other current assets
   2020  2019
Prepaid expenses  $843   $816 
Other receivables - employee   48    54 
Note receivable   —      19 
Prepaid expenses and other current assets  $891   $889 
Other current liabilities
   2020  2019
Accrual for known contingencies  $215   $145 
Customer prepayments   4    1 
Gross receipts tax payable   23    96 
State income taxes payable   83    67 
Insurance payable   420    372 
Other current liabilities  $745   $681