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Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable - Accounts Receivable (Details) - USD ($) $ in Thousands | Sep. 26, 2020 | Dec. 28, 2019
--- | --- | ---
Allowance for sales discounts and doubtful accounts | $ (1,750) | $ (1,725)
Accounts receivable, net | 32,986 | 59,760
Billed Revenues [Member] |  |
Accounts receivable, current | 20,553 | 29,214
Unbilled Revenues [Member] |  |
Accounts receivable, current | 10,424 | 13,824
Work In Progress [Member] |  |
Accounts receivable, current | 3,759 | 4,352
Accounts Receivable Subject to Arbitration [Member] |  |
Accounts receivable, current |  | $ 14,095

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