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Note 10 - Fair Value Measurement (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Oct. 31, 2021
May 31, 2018
Interest Expense, Total $ 2,519 $ 5,131 $ 10,003 $ 16,019      
The 2.75% Convertible Notes [Member]              
Debt Instrument, Interest Rate, Stated Percentage 2.75%   2.75%        
Debt Instrument, Convertible, Carrying Amount of Equity Component $ 24,500   $ 24,500   $ 22,600    
Interest Rate Swap [Member]              
Derivative Liability, Notional Amount             $ 150,000
Interest Expense, Total     2,200        
Commodity Contract [Member]              
Derivative, Notional Amount 1,500   1,500     $ 4,900  
Gain (Loss) on Sale of Commodity Contracts 1,200   4,000        
Unrealized Gain (Loss) on Derivatives and Commodity Contracts, Total $ (2,600)   200        
Derivative, Gain (Loss) on Derivative, Net, Total     $ 2,500