Note 10 - Fair Value Measurement (Details Textual) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Dec. 31, 2021	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	$ 0.7
Derivative Liability, Notional Amount Terminated	$ 60.9
Derivative Liability, Notional Amount Terminated, Percent	50.00%
The 2.75% Convertible Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage	2.75%
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 22.6	$ 28.0
Commodity Contract [Member]
Derivative, Notional Amount	17.9
Gain (Loss) on Sale of Commodity Contracts	0.4
Unrealized Gain (Loss) on Derivatives and Commodity Contracts, Total	3.3
Derivative, Gain (Loss) on Derivative, Net, Total	$ 1.0

The notional amount terminated of derivative liability.

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The percent notional amount terminated of derivative liability.

+ References

No definition available.

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Represents the balance of interest rate swaps remaining in other comprehensive income, which amount will be amortized quarterly to interest expense.

+ References

No definition available.

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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 4A
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Nominal or face amount used to calculate payments on the derivative liability.

+ References

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Nominal or face amount used to calculate payment on derivative.

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The difference between the book value and the sale price of agreements to purchase or sell mineral resources, energy, and agricultural products at some future point. This element refers to the gain (loss) included in earnings and not to the cash proceeds.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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