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Consolidated Statements of Operations and Comprehensive (Loss) Income - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]          
Revenue $ 1,057,138 $ 1,021,698 $ 1,980,773 $ 4,183,354 $ 5,856,341
Operating costs and expenses:          
Lease operating expenses 1,144,889 1,059,269 2,017,856 2,474,230 2,540,353
Depreciation, depletion and amortization 282,948 287,760 698,851 876,676 1,156,494
General and administrative expenses 2,562,531 3,512,887 6,533,642 2,434,099 2,016,110
Total operating costs and expenses 3,990,368 4,859,916 9,250,349 5,785,005 5,712,957
(Loss) income from operations (2,933,230) (3,838,218) (7,269,576) (1,601,651) 143,384
Other income (expense):          
Exchange gain (loss) (33,462) 99,441 132,033 (51,584) 42,056
Other income(expense), net 34,479 175,639 185,845 (20,500) (44,452)
Total other income (expense) 1,017 275,080 317,878 (72,084) (2,396)
(Loss) income before income tax (2,932,213) (3,563,138) (6,951,698) (1,673,735) 140,988
Income tax provision (0) (0)
Net (loss) income attributable to the Company $ (2,932,213) $ (3,563,138) (6,951,698) (1,673,735) 145,723
Net (loss) income     (6,951,698) (1,673,735) 140,988
Less: net loss attributable to non-controlling interests     (4,735)
Comprehensive (loss) income:          
Actuarial gain for post-employment benefits     549 20,356
Total comprehensive (loss) income     (6,951,698) (1,673,186) 161,344
Less: comprehensive loss attributable to Non-controlling interests     (4,735)
Comprehensive (loss) income attributable to the Company     $ (6,951,698) $ (1,673,186) $ 166,079
(Loss) income per ordinary share attributable to the Company          
Basic and diluted $ (0.39) $ (0.48) $ (0.94) $ (0.28) $ 0.02
Weighted average ordinary shares outstanding*          
Basic and diluted 7,433,673 7,382,246 7,395,120 [1] 6,048,568 [1] 6,000,000 [1]
[1] The shares are presented on a retroactive basis to reflect the nominal share issuance and the reverse stock split