Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable - Accounts Receivable (Details) - USD ($) $ in Thousands	Jul. 03, 2021	Jan. 02, 2021
Allowance for sales discounts and doubtful accounts	$ (1,418)	$ (1,750)
Accounts receivable, net	37,223	36,007
Billed Revenues [Member]
Accounts receivable, current	32,949	25,926
Unbilled Revenues [Member]
Accounts receivable, current	2,865	8,219
Work In Progress [Member]
Accounts receivable, current	$ 2,827	$ 3,612