Note 6 - Hedging Program and Derivatives - Impact of Derivative Contracts on Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Derivative liability, current	$ 0	$ 442
Derivative asset		0
Derivative liability		442
Commodity Contract [Member] \| Derivative Assets Current [Member]
Derivative asset, current		0
Commodity Contract [Member] \| Derivative Liabilities Current [Member]
Derivative liability, current		442
Commodity Contract [Member] \| Derivative Assets Noncurrent [Member]
Derivative asset, long-term		0
Commodity Contract [Member] \| Derivative Liabilities Noncurrent [Member]
Derivative liability, long-term		$ 0

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