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COMMODITY PRICE RISK DERIVATIVES (Details) - Crude Oil [Member] - Swap [Member]	9 Months Ended
	Sep. 30, 2017 $ / bbl bbl
Maximum [Member]
Begin	Jan. 01, 2018
End	Jun. 30, 2018
Quantity | bbl	300
Price (in dollars per unit) | $ / bbl	52.40
Minimum [Member]
Begin	Oct. 01, 2017
End	Dec. 31, 2017
Quantity | bbl	150
Price (in dollars per unit) | $ / bbl	52.20

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

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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

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
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X

- Definition

It represents the amount of crude oil quantity outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	useg_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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X

- Details

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