Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable - Accounts Receivable (Details) - USD ($) $ in Thousands	Apr. 02, 2022	Jan. 01, 2022
Allowance for sales discounts and doubtful accounts	$ (1,197)	$ (1,197)
Accounts receivable, net	58,757	48,240
Billed Revenues [Member]
Accounts receivable, current	44,339	37,396
Unbilled Revenues [Member]
Accounts receivable, current	13,241	10,231
Work In Progress [Member]
Accounts receivable, current	$ 2,374	$ 1,810