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Note 1 - Basis of Presentation (Details Textual) - USD ($)
 3 Months Ended
Mar. 07, 2025
Nov. 05, 2024
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Mar. 06, 2024
Dec. 31, 2023
Net Income (Loss) Attributable to Parent     $ (9,593,000) $ (6,850,000)      
Working Capital     16,600,000        
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation     (3,644,000) $ (2,873,000)      
Interest Paid, Including Capitalized Interest, Operating and Investing Activities     371,000        
Paid-in-Kind Interest     671,000        
Dividends Payable, Current     1,265,000   $ 1,288,000    
Capital Expenditures Incurred but Not yet Paid     4,300,000        
Series A Preferred Stock [Member]              
Dividends Payable, Current     $ 1,270,000        
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