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Note 18 - Subsequent Events (Details Textual)
 3 Months Ended 9 Months Ended 10 Months Ended
Oct. 21, 2025
shares
Oct. 16, 2025
USD ($)
$ / shares
shares
Oct. 09, 2025
USD ($)
shares
Aug. 19, 2025
shares
Sep. 30, 2024
USD ($)
$ / shares
Jun. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
Oct. 21, 2025
shares
Oct. 15, 2025
$ / shares
Dec. 31, 2024
$ / shares
shares
Dec. 31, 2023
$ / shares
Mar. 31, 2017
shares
Preferred Stock, Convertible, Shares Issuable             1,000            
Stock Issued In Connection with Exercise of Warrants, Value | $         $ 21,000 $ 130,000              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares         $ 56.63   $ 66.61 $ 56.63     $ 1.41 $ 50.96  
Series D Preferred Stock [Member]                          
Preferred Stock, Shares Outstanding (in shares)             481,000       0    
Proceeds from Issuance of Preferred Stock and Preference Stock | $             $ 3,786,000 $ 0          
Series D Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member]                          
Preferred Stock, Shares Outstanding (in shares)             481,250            
Stock Issued During Period, Shares, New Issues       481,250                  
Preferred Stock, Convertible, Shares Issuable       77,000,000                  
Series E Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member]                          
Stock Issued During Period, Shares, New Issues       268,750                  
Preferred Stock, Convertible, Shares Issuable       43,000,000                  
Series F Preferred Stock [Member]                          
Stock Issued During Period, Shares, New Issues       1,986,565                  
Subsequent Event [Member] | October 2025 Pre-Funded Warrants [Member]                          
Stock Issued In Connection with Exercise of Warrants, Shares (in shares)   5,405,406                      
Stock Issued In Connection with Exercise of Warrants, Value | $   $ 6,000,000                      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares   $ 1.1               $ 0.01      
Percent of Closing Price   110.00%                      
Subsequent Event [Member] | 2025 Preferred Stock Purchase Agreement [Member]                          
Preferred Stock, Convertible, Shares Issuable     43,000,000                    
Subsequent Event [Member] | 2025 Preferred Stock Purchase Agreement [Member] | Conversion of Series E Preferred Stock Into Common Stock [Member]                          
Conversion of Stock, Shares Issued (in shares)                 43,000,000        
Subsequent Event [Member] | Series D Preferred Stock [Member]                          
Preferred Stock, Convertible, Conversion Ratio 160               160        
Subsequent Event [Member] | Series D Preferred Stock [Member] | Conversion of Series D Preferred Stock Into Common Stock [Member]                          
Conversion of Stock, Shares Converted (in shares) 481,250                        
Conversion of Stock, Shares Issued (in shares)                 77,000,000        
Subsequent Event [Member] | Series D Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member]                          
Preferred Stock, Shares Outstanding (in shares)     441,326                    
Subsequent Event [Member] | Series E Preferred Stock [Member]                          
Stock Issued During Period, Shares, New Issues   268,750                      
Proceeds from Issuance of Preferred Stock and Preference Stock | $   $ 2,150,000                      
Subsequent Event [Member] | Series E Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member]                          
Preferred Stock, Shares Outstanding (in shares)     268,750                    
Stock Issued During Period, Shares, New Issues   268,750 268,750                    
Proceeds from Issuance of Preferred Stock and Preference Stock | $     $ 2,200,000                    
Preferred Stock, Convertible, Conversion Ratio 160   160           160        
Subsequent Event [Member] | Series E Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member] | Conversion of Series E Preferred Stock Into Common Stock [Member]                          
Conversion of Stock, Shares Converted (in shares) 268,750                        
Subsequent Event [Member] | Series F Preferred Stock [Member]                          
Stock Redeemed or Called During Period, Shares (in shares)   639,933                      
Stock Redeemed or Called During Period, Value | $   $ 175,000                      
The 2017 Omnibus Incentive Plan [Member]                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)                         66,243
The 2017 Omnibus Incentive Plan [Member] | Subsequent Event [Member]                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)   1,000,000                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)   1,021,332