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Discontinued Operations - Schedule of Components of Discontinued Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract] |  |  |
Rental revenue |  |  |
Operating expenses |  |  |
Net earnings for apartment complex |  |  |
Water treatment plant |  | (254) | (1,737)
Mine property holding costs |  | (2,194) | (1,133)
Impairment of mining asset |  |  | (22,620)
Depreciation of mine equipment |  |  | (122)
Total expenses for mining segment |  | (2,448) | (25,612)
Total results for discontinued operations |  | $ (2,448) | $ (25,612)

X
- Definition Amount after tax of gain (loss) not previously recognized resulting from impairment loss from discontinued operation. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the Mine property holding costs. + References No definition available. + Details
Name: | USEG_MinePropertyHoldingCosts
Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities. + References No definition available. + Details
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Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expenses related to oil and gas producing activities. + References No definition available. + Details
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Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the rental revenue. + References No definition available. + Details
Name: | USEG_ResultsOfOperationsRentalRevenue
Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total revenues from oil and gas producing activities. + References No definition available. + Details
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Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Refers to water treatment plant cost during the period. + References No definition available. + Details
Name: | USEG_WaterTreatmentPlantCost
Namespace Prefix: | USEG_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition Income before income taxes for oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 + Details
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- Definition Sales revenue to unaffiliated enterprises from oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62246-109447 + Details
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