Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable - Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Allowance for sales discounts and doubtful accounts	$ (1,443)	$ (967)
Accounts receivable, net	52,335	46,080
Billed Revenues [Member]
Accounts receivable, current	32,323	29,874
Unbilled Revenues [Member]
Accounts receivable, current	10,383	10,573
Work In Progress [Member]
Accounts receivable, current	2,252	2,494
Accounts Receivable Subject to Arbitration [Member]
Accounts receivable, current	$ 8,820	$ 4,106

Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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