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ACQUISITIONS - Revenues and direct operating costs associated with the acquired properties (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 50,339,105 | $ 51,334,225 | $ 41,798,315 | $ 32,687,179 | $ 29,924,883 | $ 29,891,391 | $ 93,132,540 | $ 59,816,274 | $ 143,471,645 | $ 92,503,453 | $ 195,702,831 | $ 120,065,361 | $ 66,699,700
Oil and natural gas production costs | 15,478,052 | 11,569,109 | 9,408,764 |  |  |  | 20,977,873 |  | 36,455,925 |  | 48,496,225 | 27,801,989 | 15,978,362
Oil and natural gas production taxes | $ 2,307,226 | $ 2,412,895 | $ 2,082,875 |  |  |  | $ 4,495,770 |  | $ 6,802,996 |  | 9,130,379 | $ 5,631,093 | $ 3,152,562
Acquired properties |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 105,102,038 |  |
Oil and natural gas production costs |  |  |  |  |  |  |  |  |  |  | 17,037,228 |  |
Oil and natural gas production taxes |  |  |  |  |  |  |  |  |  |  | 4,646,660 |  |
Total direct costs |  |  |  |  |  |  |  |  |  |  | 21,683,888 |  |
Earnings from the Acquired properties |  |  |  |  |  |  |  |  |  |  | $ 83,418,150 |  |

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