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ASSET RETIREMENT OBLIGATION (Tables) | 12 Months Ended
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Dec. 31, 2019
ASSET RETIREMENT OBLIGATION |
Schedule of asset retirement obligation | ​
​ | ​ | ​ | ​
Balance, December 31, 2016 | ​ | $ | 7,957,035
Liabilities incurred | ​ | ​ | 1,297,289
Liabilities settled | ​ | ​ | (766,595)
Accretion expense | ​ | ​ | 567,968
Balance, December 31, 2017 | ​ | $ | 9,055,697
Liabilities acquired | ​ | ​ | 2,571,549
Liabilities incurred | ​ | ​ | 1,311,956
Liabilities settled | ​ | ​ | (577,824)
Revision of estimate (1) | ​ | ​ | 87,960
Accretion expense | ​ | ​ | 606,459
Balance, December 31, 2018 | ​ | $ | 13,055,797
Liabilities acquired | ​ | ​ | 3,745,642
Liabilities incurred | ​ | ​ | 631,727
Liabilities settled | ​ | ​ | (1,589,654)
Accretion expense | ​ | ​ | 943,707
Balance, December 31, 2019 | ​ | $ | 16,787,219

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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