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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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- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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