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Note 16 - Supplemental Oil and Gas Disclosures (Unaudited) - Results of Operations (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / bbl
Dec. 31, 2017
USD ($)
$ / bbl
Dec. 31, 2016
USD ($)
$ / bbl
Revenues $ 149,030 $ 86,189 $ 56,493
Production costs (36,323) (22,425) (23,659)
Depreciation, depletion and amortization (42,237) (25,676) (22,803)
Proved property impairment (67,626)
Results of operations from oil and gas producing activities (excluding corporate overhead and interest costs) $ 72,488 $ 38,088 $ (57,595)
Depletion rate per barrel of oil equivalent (in USD per Barrel of Oil) | $ / bbl 11.8 9.52 10.08