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Note 7 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 103 Months Ended
Aug. 31, 2020
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Nov. 30, 2016
Dividends, Preferred Stock   $ 1,223 $ 1,150 $ 2,426 $ 2,287      
Preferred Stock, Shares Outstanding (in shares)   62,000   62,000   62,000 62,000  
Convertible Preferred Stock, Shares Reserved for Future Issuance (in shares)   8,700,000   8,700,000   8,700,000    
Series A Redeemable Convertible Preferred Stock [Member]                
Temporary Equity, Shares Issued (in shares)   62,000   62,000   62,000 62,000  
Deferred Offering Costs   $ 2,100   $ 2,100   $ 2,100    
Dividends, Preferred Stock   $ 1,200 $ 1,200 $ 2,400 $ 2,300      
Preferred Stock, Shares Outstanding (in shares)   62,000   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%              
Convertible Preferred Stock, Conversion Price (in dollars per share) $ 9.5              
Stock and Warrant Repurchase Plan [Member]                
Share Repurchase Program, Authorized, Amount               $ 35,000
Warrants Repurchased During Period (in shares)           6,011,926    
Warrants Repurchased During Period, Value           $ 14,700    
Share Repurchase Program, Remaining Authorized, Amount   $ 12,000   $ 12,000   $ 12,000    
Stock and Warrant Repurchase Plan [Member] | Common Stock [Member]                
Stock Repurchased During Period, Shares (in shares)       0   875,218    
Stock Repurchased During Period, Value           $ 8,300