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Note 15 - Earnings Per Share (Details Textual) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Series A Preferred Stock [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount   2.0   2.0
Series B Preferred Stock [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 1.0   1.0  
Series C Preferred Stock [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 1.0   1.0  
Convertible Notes [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share amount, value $ 25   $ 25  
Employee Stock Option [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 3.1 3.1 3.1 3.6
Antidilutive securities not included to the computation of earnings per share, amount   1.2    
Restricted Stock Units [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 0.0   0.3  
Antidilutive securities not included to the computation of earnings per share, amount   0.6   0.5