v3.26.1
Note 7 - Redeemable, Convertible Preferred Stock (Details Textual)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 11, 2026
USD ($)
Days
$ / shares
shares
Dec. 05, 2025
Feb. 26, 2021
USD ($)
$ / shares
Feb. 25, 2021
$ / shares
Jun. 30, 2026
USD ($)
$ / shares
Mar. 31, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
$ / shares
Jun. 30, 2025
Dec. 31, 2025
$ / shares
Dec. 31, 2021
USD ($)
Preferred Stock, No Par Value (in dollars per share) | $ / shares         $ 0     $ 0      
Deemed dividend         $ 2 $ 1 $ 1        
Embedded Derivative, Carrying Value of Embedded Derivative Liability $ 30       $ 40 [1]     $ 40 [1]      
Temporary equity, accretion to redemption value           $ 102          
Common stock, par value (in dollars per share) | $ / shares         $ 0.01     $ 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% 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%   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         $ 40     $ 40      
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 20, "Financial Instruments" for valuation of this derivative.