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Note 8 - Fair Value Measurement (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Nov. 30, 2019
Oct. 29, 2019
May 31, 2018
Derivative Liability, Notional Amount         $ 150.0
Interest Rate Swaps, Balance of Swaps Remaining in Other Comprehensive Income, Amount to Be Amortized Quarterly to Interest Expense $ 5.4        
The 2.75% Convertible Notes [Member]          
Debt Instrument, Interest Rate, Stated Percentage 2.75% 2.75% 2.75%    
Debt Instrument, Convertible, Carrying Amount of Equity Component $ 22.6 $ 29.7 $ 37.4 $ 37.4  
Commodity Contract [Member]          
Derivative, Notional Amount $ 8.1        
London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate 2.76%