Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable - Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Allowance for sales discounts and doubtful accounts	$ (1,600)	$ (1,100)	$ (1,197)
Accounts receivable, net	70,690	50,762	48,240
Billed Revenues [Member]
Accounts receivable, current	51,111	40,256	37,396
Unbilled Revenues [Member]
Accounts receivable, current	14,737	6,615	10,231
Work In Progress [Member]
Accounts receivable, current	$ 6,442	$ 4,991	$ 1,810