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SEGMENTS AND MAJOR CUSTOMERS (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 Segment | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  |  |  |  |  |  |  |  |  | 2 us-gaap_NumberOfReportableSegments |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,379 us-gaap_Revenues | $ 33,647 us-gaap_Revenues | $ 32,534 us-gaap_Revenues
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 28,308 us-gaap_OperatingCostsAndExpenses | 32,965 us-gaap_OperatingCostsAndExpenses | 33,769 us-gaap_OperatingCostsAndExpenses
Total interest expenses |  |  |  |  |  |  |  |  |  |  |  |  | 368 us-gaap_InterestIncomeExpenseNet | 276 us-gaap_InterestIncomeExpenseNet | 193 us-gaap_InterestIncomeExpenseNet
Operating income (loss) from identified segments | (3,203)us-gaap_OperatingIncomeLoss | (681)us-gaap_OperatingIncomeLoss | 769 us-gaap_OperatingIncomeLoss | 627 us-gaap_OperatingIncomeLoss | 581 us-gaap_OperatingIncomeLoss | 403 us-gaap_OperatingIncomeLoss | 151 us-gaap_OperatingIncomeLoss | (6,125)us-gaap_OperatingIncomeLoss | (5,898)us-gaap_OperatingIncomeLoss | (2,675)us-gaap_OperatingIncomeLoss | (957)us-gaap_OperatingIncomeLoss | (679)us-gaap_OperatingIncomeLoss | (2,488)us-gaap_OperatingIncomeLoss | (4,846)us-gaap_OperatingIncomeLoss | (10,209)us-gaap_OperatingIncomeLoss
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | (6,559)useg_OtherSellingGeneralAndAdministrativeExpenseWithAircraftImpairment | (5,673)useg_OtherSellingGeneralAndAdministrativeExpenseWithAircraftImpairment | (9,109)useg_OtherSellingGeneralAndAdministrativeExpenseWithAircraftImpairment
Add back Interest expenses |  |  |  |  |  |  |  |  |  |  |  |  | 368 us-gaap_InterestIncomeExpenseNet | 276 us-gaap_InterestIncomeExpenseNet | 193 us-gaap_InterestIncomeExpenseNet
Other revenues and expenses |  |  |  |  |  |  |  |  |  |  |  |  | 397 us-gaap_OtherNonoperatingIncomeExpense | (2,695)us-gaap_OtherNonoperatingIncomeExpense | 849 us-gaap_OtherNonoperatingIncomeExpense
(Loss) before income taxes and discontinued operations | (2,334)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (63)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 56 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 250 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (1,217)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (706)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 367 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (6,130)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (6,079)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (3,155)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 624 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (833)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (2,091)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (7,686)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (9,495)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 14,956 us-gaap_Depreciation | 13,898 us-gaap_Depreciation | 15,457 us-gaap_Depreciation
Assets by segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 123,523 us-gaap_Assets |  |  |  | 126,801 us-gaap_Assets |  |  |  | 140,827 us-gaap_Assets |  |  |  | 123,523 us-gaap_Assets | 126,801 us-gaap_Assets | 140,827 us-gaap_Assets
Reportable Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) from identified segments |  |  |  |  |  |  |  |  |  |  |  |  | 3,703 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 406 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | (1,428)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Reportable Segment [Member] | Oil and gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 32,379 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 33,647 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 32,534 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 25,323 us-gaap_OperatingCostsAndExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 29,920 us-gaap_OperatingCostsAndExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 30,870 us-gaap_OperatingCostsAndExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember
Total interest expenses |  |  |  |  |  |  |  |  |  |  |  |  | 368 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 264 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 169 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember
Operating income (loss) from identified segments |  |  |  |  |  |  |  |  |  |  |  |  | 6,688 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 3,463 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 1,495 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember
Add back Interest expenses |  |  |  |  |  |  |  |  |  |  |  |  | 368 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 264 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 169 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 14,685 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 13,623 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 14,893 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember
Assets by segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 92,020 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember |  |  |  | 97,418 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember |  |  |  | 93,839 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember |  |  |  | 92,020 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 97,418 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember | 93,839 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = useg_OilAndGasMember
Reportable Segment [Member] | Mineral properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 2,985 us-gaap_OperatingCostsAndExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember | 3,045 us-gaap_OperatingCostsAndExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember | 2,899 us-gaap_OperatingCostsAndExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember
Total interest expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember | 12 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember | 24 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember
Operating income (loss) from identified segments |  |  |  |  |  |  |  |  |  |  |  |  | (2,985)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember | (3,057)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember | (2,923)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember
Add back Interest expenses |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember | 12 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember | 24 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 123 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember | 126 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember | 127 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember
Assets by segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 21,942 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember |  |  |  | 20,739 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember |  |  |  | 20,747 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember |  |  |  | 21,942 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember | 20,739 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember | 20,747 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MiningPropertiesAndMineralRightsMember
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 148 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 149 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 437 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Assets by segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | $ 9,561 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |  |  | $ 8,644 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |  |  | $ 26,241 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |  |  | $ 9,561 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ 8,644 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ 26,241 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember

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