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Note 9 - Fair Value Measurement (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Nov. 30, 2019
The 2.75% Convertible Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		2.75%	2.75%	2.75%
Commodity Contract [Member]
Derivative Liability, Notional Amount	$ 14.0	$ 7.0
Unrealized Gain (Loss) on Derivatives and Commodity Contracts	3.3
Energy Related Derivative [Member] \| Cost of Sales [Member] \| Diesel [Member] \| Designated as Hedging Instrument [Member]
Derivative, Gain (Loss) on Derivative, Net	$ (0.9)