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Note 7 - Capital Stock (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 21, 2023
Apr. 02, 2023
Apr. 03, 2022
Proceeds from Issuance of Common Stock   $ 2,313 $ 1,482
Registered Direct Offering [Member]      
Stock Issued During Period, Shares, New Issues (in shares) 450    
Proceeds from Issuance of Common Stock $ 2,300    
Shares Issued, Price Per Share (in dollars per share) $ 5.14