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Note 3 - Revenue Recognition (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jul. 03, 2021
Jun. 27, 2020
Jan. 02, 2021
Contract with Customer, Liability, Revenue Recognized $ 100 $ 0 $ 400 $ 400  
Accounts Payable and Accrued Liabilities [Member]          
Contract with Customer, Liability, Total $ 1,000   $ 1,000   $ 400