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Note 16 - Subsequent Events (Details Textual) - Senior Unsecured Convertible Notes [Member] - USD ($)
$ / shares in Units, $ in Millions
Aug. 12, 2022
Aug. 08, 2022
Jul. 29, 2022
May 20, 2022
Debt Instrument, Interest Rate, Stated Percentage       8.00%
Debt Instrument, Convertible, Conversion Price (in dollars per share)       $ 3.33
Director [Member] | Subsequent Event [Member] | Conversion Price 6 Point 254, Maturity Date December 2028 [Member]        
Proceeds from Related Party Debt     $ 5  
Debt Instrument, Interest Rate, Stated Percentage     8.00%  
Debt Instrument, Convertible, Conversion Price (in dollars per share)     $ 6.254  
Director [Member] | Subsequent Event [Member] | Conversion Price 6 Point 15, Maturity Date December 2028 [Member]        
Proceeds from Related Party Debt   $ 4    
Debt Instrument, Interest Rate, Stated Percentage   8.00%    
Debt Instrument, Convertible, Conversion Price (in dollars per share)   $ 6.254    
Non-affiliated Party [Member] | Subsequent Event [Member] | Conversion Price 6 Point 254, Maturity Date December 2026 [Member]        
Proceeds from Related Party Debt $ 10      
Debt Instrument, Interest Rate, Stated Percentage 8.00%      
Debt Instrument, Convertible, Conversion Price (in dollars per share) $ 6.15