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Note 12 - Stockholders' Equity (Details Textual)
$ / shares in Units, $ in Millions
 1 Months Ended
Mar. 27, 2024
$ / shares
shares
Dec. 21, 2023
USD ($)
$ / shares
Apr. 27, 2023
USD ($)
$ / shares
Sep. 09, 2022
USD ($)
$ / shares
shares
Oct. 29, 2021
shares
Mar. 31, 2024
USD ($)
$ / shares
shares
Jan. 29, 2024
$ / shares
Dec. 31, 2023
shares
Mar. 31, 2023
$ / shares
shares
Common Stock, Shares Authorized (in shares)           150,000,000   150,000,000  
Preferred Stock, Shares Authorized (in shares)           5,000,000   5,000,000  
Preferred Stock, Convertible, Shares Issuable (in shares)           1,000      
May 2023 Warrants [Member]                  
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares     $ 1.3            
Series B Preferred Stock [Member]                  
Preferred Stock, Shares Outstanding (in shares)           1,000   6,000  
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares     $ 6.3       $ 0.25    
Preferred Stock, Change in Conversion Price, Income Statement Impact | $   $ 4.5   $ 5.7          
Series B Preferred Stock [Member] | Minimum [Member]                  
Preferred Stock, Convertible, Conversion Ratio             75    
Series B Preferred Stock [Member] | Previously Reported [Member]                  
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares   $ 1.3   $ 14          
Series B Preferred Stock [Member] | Revision of Prior Period, Adjustment [Member]                  
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares   $ 0.25   $ 6.3          
Series B Preferred Stock [Member] | The 2021 Private Placement Program [Member]                  
Preferred Stock, Convertible, Shares Issuable (in shares)           3,616,000     1,847,580
Stock Issued During Period, Shares, New Issues (in shares)         15,000        
Preferred Stock, Shares Outstanding (in shares)           904     11,620
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares           $ 0.25     $ 6.3
Series B Preferred Stock [Member] | The 2023 Private Placement [Member]                  
Preferred Stock, Change in Conversion Price, Income Statement Impact | $     $ 1.8            
Series C Preferred Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares) 3,250                
Preferred Stock, Shares Outstanding (in shares)           1,000   1,000  
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares $ 0.14   $ 6.3            
Preferred Stock, Change in Conversion Price, Income Statement Impact | $   $ 0.5       $ 0.4      
Series C Preferred Stock [Member] | Minimum [Member]                  
Preferred Stock, Convertible, Conversion Ratio 75                
Series C Preferred Stock [Member] | Previously Reported [Member]                  
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares   $ 1.3       $ 0.25      
Series C Preferred Stock [Member] | Revision of Prior Period, Adjustment [Member]                  
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares   $ 0.25       $ 0.14      
Series C Preferred Stock [Member] | The 2023 Private Placement [Member]                  
Preferred Stock, Change in Conversion Price, Income Statement Impact | $     $ 194.0            
Series C Preferred Stock [Member] | The 2022 Private Placement [Member]                  
Preferred Stock, Convertible, Shares Issuable (in shares)           5,192,961     357,750
Stock Issued During Period, Shares, New Issues (in shares)       3,250          
Preferred Stock, Shares Outstanding (in shares)           727     2,250
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares           $ 0.14     $ 6.3