Note 4 - Balance Sheet Components - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Jan. 02, 2021	Dec. 28, 2019
Liability for non-cancelable contracts	$ 8,492	$ 6,964
Other accrued expenses	8,770	8,941
Total accrued expenses	21,411	20,591
Accrued Liabilities [Member]
Current portion of operating lease liabilities	$ 4,149	$ 4,686