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Note 1 - Basis of Presentation (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 07, 2025
Nov. 05, 2024
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Mar. 06, 2024
Dec. 31, 2023
Net Income (Loss) Attributable to Parent     $ (7,730,000) $ (9,593,000) $ (8,872,000) $ (6,850,000) $ (17,323,000) $ (15,722,000)      
Working Capital     9,400,000       9,400,000        
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation             (5,000,000) $ (9,936,000)      
Interest Paid, Including Capitalized Interest, Operating and Investing Activities             746,000        
Paid-in-Kind Interest             1,362,000        
Dividends Payable, Current     1,288,000       1,288,000   $ 1,288,000    
Series A Preferred Stock [Member]                      
Dividends Payable, Current     $ 1,290,000       $ 1,290,000        
November 2024 Direct Offering [Member] | Certain Institutional and Individual Investors [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   $ 22,100,000                  
March 2025 Direct Offering [Member] | Certain Institutional and Individual Investors [Member]                      
Stock Issued During Period, Shares, New Issues (in shares) 5,715,000                    
Shares Issued, Price Per Share (in dollars per share) $ 3.5                    
Proceeds from Issuance of Common Stock, Gross $ 20,000,000                    
Proceeds from Issuance of Common Stock, Net $ 18,300,000                    
Senior Secured Convertible Terms Loans [Member]                      
Debt Instrument, Face Amount                   $ 20,000,000  
Secured Non Convertible Terms Loans [Member]                      
Debt Instrument, Face Amount                   21,200,000 $ 20,000,000
Convertible Loans [Member]                      
Debt Instrument, Face Amount                   $ 16,000,000