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Note 1 - Basis of Presentation (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 05, 2024
Feb. 02, 2023
Jan. 31, 2023
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Mar. 06, 2024
Net Income (Loss) Attributable to Parent       $ (6,793,000) $ (8,872,000) $ (6,850,000) $ (6,936,000) $ (7,064,000) $ (10,691,000) $ (22,515,000) $ (24,691,000)    
Working Capital       3,200,000           3,200,000      
Net Cash Provided by (Used in) Operating Activities                   (15,322,000) (15,402,000)    
Gain (Loss) on Extinguishment of Debt                   0 $ (5,331,000) $ (5,300,000)  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities                   1,116,000      
Paid-in-Kind Interest                   1,686,000      
Dividends Payable, Current       1,265,000           1,265,000   1,288,000  
Series A Preferred Stock [Member]                          
Dividends Payable, Current       $ 1,270,000           $ 1,270,000      
First Amended Credit Agreement 1 [Member]                          
Repayments of Debt     $ 15,000,000                    
Debt Instrument, Convertible, Conversion Price (in dollars per share)   $ 4.8                      
First Amended Credit Agreement 1 [Member] | Maximum [Member]                          
Debt Conversion, Original Debt, Amount   $ 15,000,000                      
Senior Secured Convertible Terms Loans [Member]                          
Debt Instrument, Face Amount                         $ 20,000,000
Secured Non Convertible Terms Loans [Member]                          
Debt Instrument, Face Amount                       20,000,000 $ 21,200,000
Convertible Loans [Member]                          
Debt Instrument, Convertible, Conversion Price (in dollars per share)                         $ 5.3
Debt Instrument, Face Amount                         $ 16,000,000
Private Placement [Member] | Direct Offering [Member]                          
Proceeds from Issuance of Common Stock                       $ 15,000,000  
Direct Offering [Member]                          
Stock Issued During Period, Shares, New Issues (in shares)     10,500,000                    
Shares Issued, Price Per Share (in dollars per share)     $ 3.84                    
Proceeds from Issuance of Common Stock, Gross     $ 40,320,000                    
Proceeds from Issuance of Common Stock, Net     $ 38,500,000                    
Direct Offering [Member] | Subsequent Event [Member]                          
Stock Issued During Period, Shares, New Issues (in shares) 7,000,000                        
Shares Issued, Price Per Share (in dollars per share) $ 3.34                        
Proceeds from Issuance of Common Stock, Gross $ 23,400,000                        
Proceeds from Issuance of Common Stock, Net $ 21,900,000