XML 104 R84.htm IDEA: XBRL DOCUMENT v3.21.1

Supplemental Oil and Natural Gas Information - Schedule of Standardized Measure of Discounted Future Net Cash Flows (Details) (Parenthetical)	Dec. 31, 2020	Dec. 31, 2019
Oil and Gas Exploration and Production Industries Disclosures [Abstract]
Annual Discount factor	10.00%	10.00%

X

- Definition

Annual Discount factor.

+ References

No definition available.

+ Details

Name:	USEG_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscount
Namespace Prefix:	USEG_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_OilAndGasExplorationAndProductionIndustriesDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration