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Note 4 - Accounts Receivable, Transit Accounts Receivable, Contract Assets and Transit Accounts Payable - Accounts Receivable (Details) - USD ($) $ in Thousands | Sep. 27, 2025 | Dec. 28, 2024
--- | --- | ---
Contract assets | $ 9,304 | $ 7,375
Provision for credit losses | (1,541) | (1,570)
Accounts receivable and contract assets, net | 83,243 | 77,960
Billed Revenues [Member] |  |
Accounts receivable, current | 52,537 | 55,224
Unbilled Revenues [Member] |  |
Accounts receivable, current | $ 22,943 | $ 16,931

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