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Note 11 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Mar. 21, 2023
Sep. 14, 2022
Feb. 09, 2022
Sep. 30, 2021
Sep. 22, 2021
Dec. 31, 2023
Jan. 01, 2023
Jan. 02, 2022
May 29, 2018
Common Stock, Shares Authorized (in shares)           200,000 200,000    
Preferred Stock, Shares Authorized (in shares)           10,000 10,000    
Proceeds from Issuance of Common Stock           $ 2,313 $ 4,682 $ 1,079  
Payments of Stock Issuance Costs           $ 20 $ 17 $ 45  
Warrants Issued in Connection with Underwritten Public Offering [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 19.32    
Warrants Issued in Connection with Underwritten Public Offering [Member] | Maximum [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             386    
Common Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)           450 797 198  
Common Stock [Member] | Maximum [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                 400
Private Placement [Member]                  
Shares Issued, Price Per Share (in dollars per share)         $ 5.43        
Payments of Stock Issuance Costs         $ 45        
Proceeds from Issuance of Common Stock, Net         $ 1,000        
Private Placement [Member] | Common Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)         125        
Registered Direct Offering [Member]                  
Proceeds from Issuance of Common Stock $ 2,300                
Registered Direct Offering [Member] | Common Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)       74          
Registered Direct Offering [Member]                  
Stock Issued During Period, Shares, New Issues (in shares) 450 487 310            
Proceeds from Issuance of Common Stock $ 2,300 $ 3,200 $ 1,500            
Shares Issued, Price Per Share (in dollars per share) $ 5.14 $ 6.57 $ 4.78