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Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable - Accounts Receivable (Details) - USD ($) $ in Thousands | Apr. 01, 2023 | Dec. 31, 2022
--- | --- | ---
Allowance for sales discounts and doubtful accounts | $ (1,100) | $ (1,100)
Accounts receivable, net | 58,809 | 50,762
Billed Revenues [Member] |  |
Accounts receivable, current | 42,325 | 40,256
Unbilled Revenues [Member] |  |
Accounts receivable, current | 12,842 | 6,615
Work In Progress [Member] |  |
Accounts receivable, current | $ 4,743 | $ 4,991

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