Note 8 - Fair Value Measurement (Details Textual) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2022	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Nov. 30, 2019	May 31, 2018
Interest Expense, Total	$ 2,519	$ 3,899	$ 3,585	$ 7,484	$ 10,003	$ 12,624	$ 20,739	$ 24,200
The 2.75% Convertible Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage						2.75%	2.75%	2.75%	2.75%
Debt Instrument, Convertible, Carrying Amount of Equity Component							$ 22,600
Interest Rate Swap [Member]
Derivative Liability, Notional Amount										$ 150,000
Interest Expense, Total						$ 2,200
Commodity Contract [Member]
Derivative, Notional Amount						7,000	$ 8,100
Gain (Loss) on Sale of Commodity Contracts						4,100
Unrealized Gain (Loss) on Derivatives and Commodity Contracts, Total						$ 400