Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Derivative Financial Instruments - Cash Receipts on Commodity Derivative Contract Settlements (Details)

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Note 6 - Derivative Financial Instruments - Cash Receipts on Commodity Derivative Contract Settlements (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash receipts (payments) on derivative settlements, net $ 12,792 $ (1,149)