Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Stockholders' Equity (Details Textual)

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Note 9 - Stockholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended
Apr. 22, 2024
Jun. 21, 2023
shares
Jun. 22, 2022
shares
Jun. 25, 2021
shares
Nov. 30, 2022
USD ($)
Aug. 31, 2021
USD ($)
Jun. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Dec. 31, 2023
$ / shares
shares
Dec. 31, 2020
shares
Common Stock, Shares Authorized (in shares)             3,750,000   3,750,000  
Common Stock, Shares, Issued (in shares)             1,320,240   1,236,688  
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares             $ 0.001   $ 0.001  
Preferred Stock, Shares Authorized (in shares)             10,000,000   10,000,000  
Preferred Stock, Shares Issued (in shares)             15,617   15,617  
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares             $ 0.001   $ 0.001  
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)             13.34      
Preferred Stock, Shares Outstanding, Ending Balance (in shares)             15,617   15,617  
Proceeds from Issuance of Common Stock | $             $ 0 $ 19,729    
Common Stock, Shares, Outstanding (in shares)             1,320,240   1,236,688  
Jefferies L L C [Member] | At the Market Offering [Member]                    
Sale of Stock, Authorized Amount | $         $ 75,000 $ 50,000        
Stock Issued During Period, Shares, New Issues (in shares)             0 300,000    
Proceeds from Issuance of Common Stock | $               $ 20,300    
Shares Issued, Price Per Share (in dollars per share) | $ / shares               $ 67.2    
Employee Director And Consultant Equity Incentive Plan2020 [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)                   43,750
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)                   19,746
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)   75,000 37,500 28,125            
The 2023 Employee Stock Purchase Plan [Member]                    
Common Stock, Capital Shares Reserved for Future Issuance (in shares)             9,375      
Series A Preferred Stock [Member]                    
Preferred Stock, Shares Issued (in shares)             85   85  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)             85   85  
Series B Preferred Stock [Member]                    
Preferred Stock, Shares Issued (in shares)             4,026   4,026  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)             4,026   4,026  
Series C Preferred Stock [Member]                    
Preferred Stock, Shares Issued (in shares)             3,506   3,506  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)             3,506   3,506  
Series D Preferred Stock [Member]                    
Preferred Stock, Shares Issued (in shares)             3,000   3,000  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)             3,000   3,000  
Series E Preferred Stock [Member]                    
Preferred Stock, Shares Issued (in shares)             5,000   5,000  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)             5,000   5,000  
Reverse Stock Split [Member]                    
Stockholders' Equity Note, Stock Split, Conversion Ratio 80