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Note 3 - Net Loss Per Share (Details Textual) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jul. 03, 2022
Jul. 04, 2021
Jul. 03, 2022
Jul. 04, 2021
May 29, 2018
Common Stock [Member] | Maximum [Member]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         386
Share-Based Payment Arrangement [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 536 255 536 255