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Note 6 - Redeemable, Convertible Preferred Stock (Details Textual)
$ / shares in Units, $ in Millions
9 Months Ended
Feb. 26, 2024
Feb. 26, 2023
Feb. 26, 2021
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Preferred Stock, No Par Value (in dollars per share)       $ 0 $ 0
Series A Preferred Stock [Member]          
Temporary Equity, Liquidation Preference Per Share (in dollars per share)       100 $ 100
Series A Preferred Stock [Member] | Repurchase And Exchange Agreement [Member]          
Stock Exchanged During Period, Shares (in shares) | shares     1,000,000    
Series B Preferred Stock [Member]          
Preferred Stock, Dividend Rate, Percentage     4.00%    
Preferred Stock, No Par Value (in dollars per share)     $ 0    
Temporary Equity, Fair Value of Preferred Stock at Issuance | $     $ 95    
Debt Instrument, Convertible, Stock Price Trigger (in dollars per share)       $ 14.50  
Debt Instrument, Convertible, Threshold Trading Days       45  
Debt Instrument, Convertible, Threshold Consecutive Trading Days       60  
Embedded Derivative, Fair Value of Embedded Derivative Liability | $     $ 1    
Series B Preferred Stock [Member] | Other Noncurrent Liabilities [Member]          
Embedded Derivative, Fair Value of Embedded Derivative Liability | $       $ 1 $ 1
Series B Preferred Stock [Member] | Purchase Agreement [Member]          
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | shares     9.5238    
Preferred Stock, Convertible, Conversion Price (in dollars per share)     $ 10.50    
Series C Preferred Stock [Member]          
Debt Instrument, Convertible, Threshold Trading Days       45  
Debt Instrument, Convertible, Threshold Consecutive Trading Days       60  
Embedded Derivative, Fair Value of Embedded Derivative Liability | $     $ 2    
Series C Preferred Stock [Member] | After February Twenty Six Two Thousand Twenty Three [Member] | Forecast [Member]          
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   200.00%      
Series C Preferred Stock [Member] | After February Twenty Six Two Thousand Twenty Four [Member] | Forecast [Member]          
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 150.00%        
Series C Preferred Stock [Member] | Other Noncurrent Liabilities [Member]          
Embedded Derivative, Fair Value of Embedded Derivative Liability | $       $ 1 $ 2
Series C Preferred Stock [Member] | Purchase Agreement [Member]          
Preferred Stock, Dividend Rate, Percentage     5.00%    
Preferred Stock, No Par Value (in dollars per share)     $ 0    
Preferred Stock, Convertible, Conversion Price (in dollars per share)     $ 10    
Convertible Preferred Stock, Shares Reserved for Future Issuance (in shares) | shares     1,000,000    
Temporary Equity, Liquidation Preference Per Share (in dollars per share)     $ 100    
Gross Proceeds Owed on Issuance of PreferredStock | $     $ 100    
Series C Preferred Stock [Member] | Dividend And Other Rights [Member]          
Preferred Stock, Dividend Rate, Percentage     5.00%