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Note 7 - Redeemable, Convertible Preferred Stock (Details Textual)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 11, 2026
USD ($)
Days
$ / shares
shares
Dec. 05, 2025
Feb. 26, 2021
USD ($)
$ / shares
Feb. 25, 2021
$ / shares
Mar. 31, 2026
USD ($)
$ / shares
Mar. 31, 2025
USD ($)
Dec. 31, 2025
$ / shares
Dec. 31, 2021
USD ($)
Preferred Stock, No Par Value (in dollars per share) | $ / shares         $ 0      
Deemed dividend         $ 1 $ 1    
Embedded Derivative, Carrying Value of Embedded Derivative Liability $ 30       42 [1]      
Temporary equity, accretion to redemption value         $ 102      
Common stock, par value (in dollars per share) | $ / shares         $ 0.01   $ 0.01  
4.0% Series B Preferred Stock [Member]                
Preferred Stock, Dividend Rate, Percentage 4.00%   4.00% 4.00% 4.00% 4.00% 4.00%  
Preferred Stock, No Par Value (in dollars per share) | $ / shares       $ 0        
Temporary Equity, Fair Value of Preferred Stock at Issuance     $ 95          
Derivative Liability, Subject to Master Netting Arrangement, before Offset     1          
Temporary Equity Issuance Of Redeemable Convertible Preferred Stock Net Of Offering Costs And Derivative Liability     $ 93          
Temporary Equity, Liquidation Preference Per Share (in dollars per share) | $ / shares     $ 100          
4.0% Series B Preferred Stock [Member] | Other Noncurrent Liabilities [Member]                
Embedded Derivative, Carrying Value of Embedded Derivative Liability     $ 1         $ 1
6.0% Series B Preferred Stock [Member]                
Preferred Stock, Dividend Rate, Percentage 6.00%       6.00% 6.00% 6.00%  
Preferred Stock, Conversion Ratio 0.33              
Preferred Stock, No Par Value (in dollars per share) | $ / shares $ 0              
Temporary Equity, Fair Value of Preferred Stock at Issuance $ 102              
Deemed dividend $ 2              
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares $ 10              
Embedded Derivative, Carrying Value of Embedded Derivative Liability $ 30              
Temporary equity, accretion to redemption value $ 72              
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares $ 100              
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | shares 10              
Beneficial ownership limitation percentage 4.99%              
6.0% Series B Preferred Stock [Member] | Other Noncurrent Liabilities [Member]                
Embedded Derivative, Carrying Value of Embedded Derivative Liability         $ 42      
6.0% Series B Preferred Stock [Member] | After Eighteen Months from Amendment Date [Member]                
Debt Instrument, Convertible, Stock Price Trigger (in dollars per share) | $ / shares $ 14.5              
6.0% Series B Preferred Stock [Member] | After Twenty Four Months From Amendment Date [Member]                
Debt Instrument, Convertible, Stock Price Trigger (in dollars per share) | $ / shares 15.5              
6.0% Series B Preferred Stock [Member] | After Thirty Months From Amendment Date [Member]                
Debt Instrument, Convertible, Stock Price Trigger (in dollars per share) | $ / shares $ 16.5              
6.0% Series B Preferred Stock [Member] | Minimum [Member]                
Debt Instrument, Convertible, Threshold Trading Days | Days 45              
6.0% Series B Preferred Stock [Member] | Maximum [Member]                
Debt Instrument, Convertible, Threshold Trading Days | Days 60              
Series B Preferred Stock [Member]                
Preferred Stock, Dividend Rate, Percentage         6.00%   4.00%  
Purchase Agreement [Member] | 4.0% Series B Preferred Stock [Member]                
Temporary Equity, Fair Value of Preferred Stock at Issuance     $ 95          
Dividend And Other Rights [Member]                
Common stock, par value (in dollars per share) | $ / shares $ 0.01              
Dividend And Other Rights [Member] | 6.0% Series B Preferred Stock [Member]                
Preferred Stock, Dividend Rate, Percentage 6.00%              
Temporary Equity, Liquidation Preference Per Share (in dollars per share) | $ / shares $ 100              
KL Funds [Member] | 4.0% Series B Preferred Stock [Member]                
Preferred Stock, Dividend Rate, Percentage   4.00%            
[1] Refer to Note 7, "Redeemable Convertible Preferred Stock" for additional details and Note 19, "Financial Instruments" for valuation of this derivative.