Annual report pursuant to Section 13 and 15(d)

ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES- Total depletion and depletion per barrel (Details)

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ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES- Total depletion and depletion per barrel (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Depletion $ 42,634,294 $ 55,870,246 $ 38,810,864
Depletion rate, per barrel-of-oil-equivalent (BOE) $ 13.25 $ 14.15 $ 17.38