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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, PROPERTY, PLANT AND EQUIPMENT (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 DollarUSPerMillionsofBTU Center | Dec. 31, 2013 | Dec. 31, 2012
Oil and Gas properties [Abstract] |  |  |
Proved | $ 147,486,000 us-gaap_CapitalizedCostsProvedProperties | $ 136,521,000 us-gaap_CapitalizedCostsProvedProperties |
Unproved | 10,188,000 us-gaap_CapitalizedCostsUncompletedWellsEquipmentAndFacilities | 7,478,000 us-gaap_CapitalizedCostsUncompletedWellsEquipmentAndFacilities |
Exploratory wells in progress | 2,357,000 useg_WellsInProgress | 0 useg_WellsInProgress |
Oil & Gas properties | 160,031,000 us-gaap_OilAndGasPropertyFullCostMethodGross | 143,999,000 us-gaap_OilAndGasPropertyFullCostMethodGross |
Less accumulated depreciation depletion and amortization | (71,762,000)us-gaap_OilAndGasPropertyFullCostMethodDepletion | (57,077,000)us-gaap_OilAndGasPropertyFullCostMethodDepletion |
Net book value | 88,269,000 us-gaap_OilAndGasPropertyFullCostMethodNet | 86,922,000 us-gaap_OilAndGasPropertyFullCostMethodNet |
Mining properties | 21,942,000 us-gaap_MineralPropertiesNet | 20,739,000 us-gaap_MineralPropertiesNet |
Property, plant and equipment | 8,346,000 us-gaap_PropertyPlantAndEquipmentOther | 8,334,000 us-gaap_PropertyPlantAndEquipmentOther |
Less accumulated depreciation | (4,404,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (4,135,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |
Net book value | 3,942,000 us-gaap_PropertyPlantAndEquipmentOtherNet | 4,199,000 us-gaap_PropertyPlantAndEquipmentOtherNet |
Oil and Gas Properties [Abstract] |  |  |
Capitalized costs excluded from amortized cost pool | 12,500,000 useg_CapitalizedCostsOfUnprovedPropertiesAndWellsInprogressExcludedFromAmortizationCumulative | 7,500,000 useg_CapitalizedCostsOfUnprovedPropertiesAndWellsInprogressExcludedFromAmortizationCumulative |
Capitalized costs related to unevaluated properties included in the amortization base | 0 useg_CapitalizedCostsOfUnevaluatedPropertyIncludedInAmortizationBase | 0 useg_CapitalizedCostsOfUnevaluatedPropertyIncludedInAmortizationBase |
Percentage of discount used for future net revenue (in hundredths) | 10.00%useg_PercentageOfDiscountUsedForFutureNetRevenue |  |
Period for calculating unescalated average prices prior to the end of reporting period | 12 months |  |
Number of cost centers for quarterly ceiling test for oil and gas | 1 useg_NumberOfCostCentersForQuarterlyCeilingTestForOilAndGas |  |
Price per barrel for oil at ceiling test (in dollars per barrel) | 94.99 useg_PricePerBarrelForOilAtCeilingTest |  |
Price for natural gas at ceiling test (dollars per MMbtu) | 4.35 useg_PricePerBarrelForNaturalGasAtCeilingTest |  |
Proved property impairments | $ 0 us-gaap_ImpairmentOfOilAndGasProperties | $ 5,828,000 us-gaap_ImpairmentOfOilAndGasProperties | $ 5,189,000 us-gaap_ImpairmentOfOilAndGasProperties
Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 45 years |  |
Office Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Office Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 5 years |  |
Field Tools and Hand Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 5 years |  |
Field Tools and Hand Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 7 years |  |
Vehicles and Trucks [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Vehicles and Trucks [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 7 years |  |
Heavy Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 7 years |  |
Heavy Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 10 years |  |
Service Buildings [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 20 years |  |
Corporate Headquarter Building [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 45 years |  |

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- Definition Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Glossary Proved Properties -URI http://asc.fasb.org/extlink&oid=6522428 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Properties -URI http://asc.fasb.org/extlink&oid=21914647 + Details
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370743&loc=d3e66150-109466 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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