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Note 2 - Recently Issued and Adopted Accounting Pronouncements (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
Sep. 30, 2022
Jan. 01, 2022
Dec. 31, 2021
Sep. 30, 2021
Aug. 31, 2020
Warrants Issued With 2.75% Convertible Notes [Member]          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 53.44        
Accounting Standards Update 2020-06 [Member]          
Long-Term Debt, Gross   $ 22.0      
Deferred Tax Assets, Net of Valuation Allowance, Total   5.6      
Additional Paid in Capital, Total   $ (16.4)      
The 2.75% Convertible Notes [Member]          
Debt Instrument, Interest Rate, Stated Percentage 2.75%        
Convertible Debt [Member] | The 2.75% Convertible Notes [Member]          
Debt Instrument, Interest Rate, Stated Percentage 2.75%   2.75% 2.75% 2.75%
Long-Term Debt, Gross $ 230.0        
Convertible Debt Instrument, Shares Per $1,000 of Principal Converted 31.7776        
Debt Instrument, Convertible, Conversion Price (in dollars per share) $ 31.47        
Debt Instrument, Convertible, Percent of Share Price to Conversion Price, Trigger 130.00%        
Debt Instrument, Convertible, Percent of Principal Amount Potentially Repurchaseable 100.00%