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Note 3 - Net Loss Per Share (Details Textual) - $ / shares
3 Months Ended 6 Months Ended
Jul. 02, 2023
Jul. 02, 2023
May 29, 2018
Common Stock [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 19.32
Warrants and Rights Outstanding, Maturity Date     May 29, 2023
Common Stock [Member] | Maximum [Member]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     386,000
Share-Based Payment Arrangement [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 739 536