Note 6 - Hedging Program and Derivatives - Impact of Derivative Contracts on Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Derivative asset, current	$ 34,020	$ 83
Derivative liability, current	800	10,688
Derivative asset, long-term	36,788	4,170
Derivative liability, long-term		999
Derivative asset	70,808	4,253
Derivative liability	800	11,687
Commodity Contract [Member] \| Derivative Assets Current [Member]
Derivative asset, current	34,020	83
Commodity Contract [Member] \| Derivative Liabilities Current [Member]
Derivative liability, current	800	10,688
Commodity Contract [Member] \| Derivative Assets Noncurrent [Member]
Derivative asset, long-term	36,788	4,170
Commodity Contract [Member] \| Derivative Liabilities Noncurrent [Member]
Derivative liability, long-term		$ 999

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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