Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable - Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 29, 2025	Dec. 28, 2024
Provision for credit losses	$ (1,570)	$ (1,570)
Accounts receivable, net	68,390	77,960
Billed Revenues [Member]
Accounts receivable, current	47,096	55,224
Unbilled Revenues [Member]
Accounts receivable, current	14,178	16,931
Work In Progress [Member]
Accounts receivable, current	$ 8,686	$ 7,375