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Commodity Risk Management Activities - Fair value of asset (liability) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Commodity Risk Management Activities        
Fair value of asset (liability), beginning of the period $ 401,141 $ 2,374,878   $ 1,999,802
Gains (losses) on derivative contracts included in earnings (1,827,334) (85,348) $ (1,361,993) 1,635,669
Settlement of commodity derivative contracts 91,660 (1,031,828) 27,460 (2,377,769)
Fair value of asset, end of the period $ (1,334,533) $ 1,257,702 $ (1,334,533) $ 1,257,702