Exploration License - Additional Information (Detail) - USD ($)	6 Months Ended
Jun. 30, 2021	Jul. 09, 2019
Business Acquisition [Line Items]
Impairment expense	$ 0
Bismarck [Member]
Business Acquisition [Line Items]
Annual Fee Due		$ 14,000
Accounting Standards Update 2017-01 [Member]
Business Acquisition [Line Items]
Percent of ownership acquired		79.90%

The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration