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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 3 Months Ended | 12 Months Ended
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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 Operator | Dec. 31, 2013 Operator | Dec. 31, 2012 Operator
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of equity investment |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | $ 2,160,000 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | $ 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
Marketable Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains in the marketable securities |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax | 45,000 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax |
Accounts Receivable [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bad debt expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ProvisionForDoubtfulAccounts | 0 us-gaap_ProvisionForDoubtfulAccounts |
Reserve for uncollectable receivables | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |  |  | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |  |  |  |  |  |  | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |
Valuation of Equity Method Investment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash impairment charge on equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | 2,160,000 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of payment received after date of production, minimum |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |
Period of payment received after date of production, maximum |  |  |  |  |  |  |  |  |  |  |  |  | 90 days |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of major operators |  |  |  |  |  |  |  |  |  |  |  |  | 3 useg_NumberOfMajorOperators | 3 useg_NumberOfMajorOperators | 2 useg_NumberOfMajorOperators
Assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk free interest rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 2.06%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate | 1.66%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate |
Expected lives |  |  |  |  |  |  |  |  |  |  |  |  | 6 years | 6 years |
Expected volatility (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 65.45%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate | 62.59%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate |
Expected dividend yield (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares held by the ESOP (in shares) | 949,870 us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP |  |  |  | 877,399 us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP |  |  |  | 824,123 us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP |  |  |  | 949,870 us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP | 877,399 us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP | 824,123 us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP
Summary of calculations of basic and diluted earnings per share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) | (2,334,000)us-gaap_NetIncomeLoss | (63,000)us-gaap_NetIncomeLoss | 56,000 us-gaap_NetIncomeLoss | 250,000 us-gaap_NetIncomeLoss | (1,220,000)us-gaap_NetIncomeLoss | (834,000)us-gaap_NetIncomeLoss | 573,000 us-gaap_NetIncomeLoss | (5,898,000)us-gaap_NetIncomeLoss | (7,929,000)us-gaap_NetIncomeLoss | (1,945,000)us-gaap_NetIncomeLoss | (990,000)us-gaap_NetIncomeLoss | (381,000)us-gaap_NetIncomeLoss | (2,091,000)us-gaap_NetIncomeLoss | (7,379,000)us-gaap_NetIncomeLoss | (11,245,000)us-gaap_NetIncomeLoss
Basic weighted-average common shares outstanding (in shares) | 27,905,940 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,905,940 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,785,280 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,738,083 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,682,602 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,682,602 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,682,272 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 2,766,710 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,475,813 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,468,355 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,460,483 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,438,584 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,832,859 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,678,698 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,466,549 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Add: dilutive effect of stock options (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted-average common shares outstanding (in shares) | 27,905,940 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,905,940 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 28,237,883 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 28,142,253 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,682,602 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,682,602 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,682,272 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,667,102 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,475,813 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,468,355 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,460,483 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,438,584 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,832,859 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,678,698 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,466,549 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net (loss) per share (in dollars per share) | $ (0.08)us-gaap_EarningsPerShareBasic | $ 0 us-gaap_EarningsPerShareBasic | $ 0 us-gaap_EarningsPerShareBasic | $ 0.01 us-gaap_EarningsPerShareBasic | $ (0.04)us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ 0.02 us-gaap_EarningsPerShareBasic | $ (0.21)us-gaap_EarningsPerShareBasic | $ (0.29)us-gaap_EarningsPerShareBasic | $ (0.07)us-gaap_EarningsPerShareBasic | $ (0.04)us-gaap_EarningsPerShareBasic | $ (0.01)us-gaap_EarningsPerShareBasic | $ (0.08)us-gaap_EarningsPerShareBasic | $ (0.27)us-gaap_EarningsPerShareBasic | $ (0.41)us-gaap_EarningsPerShareBasic
Diluted net (loss) per share (in dollars per share) | $ (0.08)us-gaap_EarningsPerShareDiluted | $ 0 us-gaap_EarningsPerShareDiluted | $ 0 us-gaap_EarningsPerShareDiluted | $ 0.01 us-gaap_EarningsPerShareDiluted | $ (0.04)us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ 0.02 us-gaap_EarningsPerShareDiluted | $ (0.21)us-gaap_EarningsPerShareDiluted | $ (0.29)us-gaap_EarningsPerShareDiluted | $ (0.07)us-gaap_EarningsPerShareDiluted | $ (0.04)us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ (0.08)us-gaap_EarningsPerShareDiluted | $ (0.27)us-gaap_EarningsPerShareDiluted | $ (0.41)us-gaap_EarningsPerShareDiluted
Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average anti-dilutive stock options (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,355,195 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 2,531,202 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 2,491,746 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk free interest rate, minimum (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.82%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum / us-gaap_RangeAxis = us-gaap_MinimumMember
Expected lives |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years
Expected volatility, minimum (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61.87%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk free interest rate, maximum (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.41%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum / us-gaap_RangeAxis = us-gaap_MaximumMember
Expected lives |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years
Expected volatility, maximum (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 63.59%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum / us-gaap_RangeAxis = us-gaap_MaximumMember
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk free interest rate, minimum (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.82%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Risk free interest rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 2.06%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1.66%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Risk free interest rate, maximum (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.41%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Expected lives |  |  |  |  |  |  |  |  |  |  |  |  | 6 years | 6 years |
Expected volatility, minimum (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61.87%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Expected volatility (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 65.45%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 62.59%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Expected volatility, maximum (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 63.59%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Expected dividend yield (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Stock Options [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected lives |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years
Stock Options [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected lives |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years
Statoil and Zavanna [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit risk, percentage (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 28.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = useg_StatoilAndZavannaMember | 38.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = useg_StatoilAndZavannaMember | 57.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = useg_StatoilAndZavannaMember
Contango Oil & Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit risk, percentage (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 38.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = useg_ContangoOilGasMember | 32.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = useg_ContangoOilGasMember |
NGL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit risk, percentage (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 20.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = useg_NglMember | 18.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = useg_NglMember | 32.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = useg_NglMember
Standard Steam Trust LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of equity investment |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,160,000 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = useg_StandardSteamTrustLlcMember |
Ownership interest (in hundredths) | 19.54%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = useg_StandardSteamTrustLlcMember |  |  |  |  |  |  |  |  |  |  |  | 19.54%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = useg_StandardSteamTrustLlcMember |  |
Valuation of Equity Method Investment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash impairment charge on equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,160,000 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = useg_StandardSteamTrustLlcMember |

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