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Note 7 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Aug. 31, 2020
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dividends, Preferred Stock   $ 1,239 $ 1,168 $ 3,667 $ 3,455  
Preferred Stock, Shares Outstanding (in shares)   62,000   62,000   62,000
Convertible Preferred Stock, Shares Reserved for Future Issuance (in shares)   8,800,000   8,800,000    
Series A Redeemable Convertible Preferred Stock [Member]            
Temporary Equity, Shares Issued (in shares)   62,000   62,000   62,000
Deferred Offering Costs   $ 2,100   $ 2,100    
Dividends, Preferred Stock   $ 1,200 $ 1,200 $ 3,700 $ 3,500  
Preferred Stock, Shares Outstanding (in shares)   62,000   62,000    
Series A Redeemable Convertible Preferred Stock [Member] | Private Placement [Member]            
Temporary Equity, Shares Issued (in shares) 85,000          
Shares Issued, Price Per Share (in dollars per share) $ 1,000          
Proceeds from Issuance of Preferred Stock and Preference Stock $ 85,000          
Preferred Stock, Dividend Rate, Percentage 6.00%          
Preferred Stock, Convertible, Conversion Price (in dollars per share) $ 9.5 $ 14.25   $ 14.25