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Note 5 - Redeemable, Convertible Preferred Stock - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Feb. 26, 2021
Jun. 30, 2022
Dec. 31, 2021
Temporary Equity [Line Items]      
Preferred stock, par value   $ 0 $ 0
Series A Preferred Stock [Member] | Repurchase and Exchange Agreement [Member]      
Temporary Equity [Line Items]      
Stock exchanged during period shares 1,000,000    
Series B Preferred Stock [Member]      
Temporary Equity [Line Items]      
Percentage of dividend payable on preferred stock 4.00%    
Preferred stock, par value    
Temporary equity fair value of preferred stock at the time of issuance $ 95    
Preferred stock conversion description   The Company will have the right to cause the mandatory conversion of the Series B Preferred Stock into shares of Common Stock at any time after the initial issuance of the Series B Preferred Stock if the closing price of the Common Stock has equaled or exceeded $14.50 (subject to adjustment in the same manner as the conversion price) for 45 trading days within a period of 60 consecutive trading days.  
Common stock price equal or exceeds preferred stock conversion price $ 14.50 $ 14.50  
Fair value allocated to derivative liability $ 1    
Preferred stock, redemption date May 28, 2026    
Series B Preferred Stock [Member] | Repurchase and Exchange Agreement [Member]      
Temporary Equity [Line Items]      
Temporary equity exchange basis one-for-one    
Series B Preferred Stock [Member] | Purchase Agreement [Member]      
Temporary Equity [Line Items]      
Initial conversion rate of preferred stock to common stock 9.5238    
Initial conversion price of preferred stock per share of common stock $ 10.50    
Series B Preferred Stock Embedded Derivative [Member] | Other Long-Term Liabilities [Member]      
Temporary Equity [Line Items]      
Fair value of derivative liability   $ 1 $ 1
Series C Preferred Stock [Member]      
Temporary Equity [Line Items]      
Net proceeds received to derivative liability $ 2    
Series C Preferred Stock [Member] | After February 26, 2023 [Member]      
Temporary Equity [Line Items]      
Common stock price equal or exceeds preferred stock conversion price percentage   200.00%  
Series C Preferred Stock [Member] | After February 26, 2024 [Member]      
Temporary Equity [Line Items]      
Common stock price equal or exceeds preferred stock conversion price percentage   150.00%  
Series C Preferred Stock [Member] | Purchase Agreement [Member]      
Temporary Equity [Line Items]      
Preferred stock, par value    
Initial conversion price of preferred stock per share of common stock $ 10    
Preferred stock, redemption date May 28, 2026    
Preferred stock, purchase agreement date Feb. 26, 2021    
Preferred stock, number of shares issued 1,000,000    
Percentage of in-kind dividend payable on preferred stock 5.00%    
Preferred stock, liquidation preference per share $ 100    
Gross proceeds owed on issuance of preferred stock $ 100    
Series C Preferred Stock [Member] | Dividend and Other Rights [Member]      
Temporary Equity [Line Items]      
Percentage of dividend payable on preferred stock 5.00%    
Series C Preferred Stock Embedded Derivative [Member] | Other Long-Term Liabilities [Member]      
Temporary Equity [Line Items]      
Fair value of derivative liability   $ 1 $ 2