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Commodity Price Risk Derivatives - Schedule of Outstanding Crude Oil and Natural Gas Swaps (Details) - Swap [Member]	12 Months Ended
	Dec. 31, 2017 $ / bbl $ / Mcf bbl Mcf
Natural Gas (mcfe) [Member] | Purchase [Member]
Begin	Jan. 01, 2018
End	Dec. 31, 2018
Quantity | Mcf	2,500
Price | $ / Mcf	3.01
Natural Gas (mcfe) [Member] | Sales [Member]
Begin	Jan. 01, 2018
End	Dec. 31, 2018
Quantity | Mcf	2,000
Price | $ / Mcf	2.98
Crude Oil [Member] | Purchase [Member]
Begin	Jan. 01, 2018
End	Jun. 30, 2018
Quantity | bbl	150
Price | $ / bbl	52.20

X

- Definition

It represents the amount of crude oil and natural gas quantity outstanding.

+ References

No definition available.

+ Details

Name:	USEG_OutstandingCrudeOilAndNaturalGasQuantity
Namespace Prefix:	USEG_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The average consolidated production costs (lifting costs) per unit of production. Costs may include costs incurred to operate and maintain wells and equipment and to pay production taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1204
-Paragraph (b)
-Subparagraph (2)

+ Details

Name:	us-gaap_ConsolidatedOilAndGasProductionCostsPerUnitOfProduction
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeInceptionDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeMaturityDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_SwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ReserveQuantitiesByTypeOfReserveAxis=us-gaap_NaturalGasReservesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=USEG_PurchaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_EnergyAxis=us-gaap_CrudeOilMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: