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Fair Value Measurements (Details Narrative) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares
Warrant strike price | $ / shares	$ 3.92	$ 11.30
Average value of warrants		$ 73
Fair value of marketable equity securities	$ 0
Measurement Input, Discount Rate [Member]
Fair value meaeurement input	10
Minimum [Member]
Average value of warrants		60
Maximum [Member]
Average value of warrants		$ 120

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- Definition

Average value of warrants.

+ References

No definition available.

+ Details

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Namespace Prefix:	USEG_
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Balance Type:	debit
Period Type:	instant

X

- Definition

fair value of marketable equity securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	USEG_
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Balance Type:	debit
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X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

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X

- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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