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Fair Value Measurements (Details Narrative) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Warrant liability	$ 79	$ 73
Percentage for discount rate	10.00%
Level 3 [Member]
Percentage for discount rate	10.00%

X

- Definition

Percentage for discount rate.

+ References

No definition available.

+ Details

Name:	USEG_PercentageForDiscountRate
Namespace Prefix:	USEG_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Refers to carrying amount of warrant liability as on balance sheet date.

+ References

No definition available.

+ Details

Name:	USEG_WarrantLiability
Namespace Prefix:	USEG_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: