Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable - Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Allowance for sales discounts and doubtful accounts	$ (1,100)	$ (1,197)	$ (1,750)
Accounts receivable, net	50,762	48,240	36,007
Billed Revenues [Member]
Accounts receivable, current	40,256	37,396	25,926
Unbilled Revenues [Member]
Accounts receivable, current	6,615	10,231	8,219
Work In Progress [Member]
Accounts receivable, current	$ 4,991	$ 1,810	$ 3,612