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Derivative financial instruments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Gain (loss) on derivatives	$ 1,738,871	$ 33,643
Oil derivatives [Member]
Gain (loss) on derivatives	1,738,871	25,894
Natural gas derivatives [Member]
Gain (loss) on derivatives	$ 0	$ 7,749

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- Definition

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

+ Details

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- Details

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- Details

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Period Type: