Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable - Accounts Receivable (Details) - USD ($) $ in Thousands	Jul. 01, 2023	Dec. 31, 2022
Allowance for sales discounts and doubtful accounts	$ (1,100)	$ (1,100)
Accounts receivable, net	61,614	50,762
Billed Revenues [Member]
Accounts receivable, current	49,694	40,256
Unbilled Revenues [Member]
Accounts receivable, current	8,372	6,615
Work In Progress [Member]
Accounts receivable, current	$ 4,648	$ 4,991