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Note 3 - Fair Value Measurements - Fair Value of Open Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Derivatives instruments - open contracts, current [1] $ 7,266 $ 60,687
Derivatives 2,653 21,275
Open Contracts [Member]    
Derivatives instruments - open contracts, current 6,921 74,580
Derivatives 2,653
Derivatives instruments - open contracts, current $ 1,785
[1] Includes both open and closed contracts.