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Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable - Accounts Receivable (Details) - USD ($) $ in Thousands | Sep. 28, 2019 | Dec. 29, 2018
--- | --- | ---
Allowance for sales discounts and doubtful accounts | $ (1,545) | $ (1,443)
Accounts receivable, net | 57,470 | 52,335
Billed Revenues [Member] |  |
Accounts receivable, current | 25,889 | 32,323
Unbilled Revenues [Member] |  |
Accounts receivable, current | 17,191 | 10,383
Work In Progress [Member] |  |
Accounts receivable, current | 3,758 | 2,252
Accounts Receivable Subject to Arbitration [Member] |  |
Accounts receivable, current | $ 12,177 | $ 8,820

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