Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable - Accounts Receivable (Details) - USD ($) $ in Thousands	Jan. 02, 2021	Dec. 28, 2019
Allowance for sales discounts and doubtful accounts	$ (1,750)	$ (1,725)
Accounts receivable, net	36,007	59,760
Billed Revenues [Member]
Accounts receivable, current	25,926	29,214
Unbilled Revenues [Member]
Accounts receivable, current	8,219	13,824
Work In Progress [Member]
Accounts receivable, current	3,612	4,352
Accounts Receivable Subject to Arbitration [Member]
Accounts receivable, current		$ 14,095