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Commodity Derivative Contracts (Details Textuals) - Crude Oil [Member] - Minimum
3 Months Ended
Dec. 31, 2020
Initial measurement period (Aug. 1, 2020 - July 31, 2021)  
Derivative [Line Items]  
Required hedge percentage 65.00%
Subsequent measurement period (August 1, 2021 - July 31, 2022)  
Derivative [Line Items]  
Required hedge percentage 35.00%