XML 68 R49.htm IDEA: XBRL DOCUMENT
v3.3.1.900

OIL AND GAS PRODUCING ACTIVITIES (Details Narrative) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May. 31, 2014 USD ($) a Number | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) $ / Unit | Dec. 31, 2014 USD ($) $ / Unit | Dec. 31, 2013 USD ($) $ / Unit
Gross aquired (in acres) | a | 16 |  |  |  |  |  |  |  |  |  |  |
Net aquired (in acres) | a | 286 |  |  |  |  |  |  |  |  |  |  |
Transaction cost | $ 12,200 |  |  |  |  |  |  |  |  |  |  |
Unproved properties |  | $ 5,664 |  |  |  | $ 10,188 |  |  |  | $ 5,664 | $ 10,188 |
Net (Gross) acquired (in acres) | a | 0.62 |  |  |  |  |  |  |  |  |  |  |
Adjustments related to revenue receivable and accounts payable | $ 681 |  |  |  |  |  |  |  |  |  |  |
Reduction of evaluated properties | $ 11,500 |  |  |  |  |  |  |  |  |  |  |
Proceeds from settlement |  |  |  |  |  |  |  |  |  | $ 1,500 |  |
Discount rate |  |  |  |  |  |  |  |  |  | 10.00% |  |
Impairment of the oil and gas properties |  | $ (13,782) | $ (21,446) | $ (3,208) | $ (19,240) |  |  |  |  | $ 57,676 |  | $ 5,828
Depreciation, depletion and amortization per equivelent BOE | $ / Unit |  |  |  |  |  |  |  |  |  | 26.80 | 31.56 | 32.06
Unproved lease acquisition costs |  |  |  |  |  |  |  |  |  | $ 5,664 | $ 10,188 | $ 1,760
Exploratory wells in progress |  |  |  |  |  | $ 2,357 |  |  |  |  | 2,357 |
Transferred unproved properties |  | $ 2,500 |  |  |  |  |  |  |  |  |  |
Asset retirement obligations |  | $ 61 |  |  |  | $ 281 |  |  |  | $ 61 | $ 281 | $ 131
Oil (bbls) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  |  |  |  |  |  |  |  |  | 50.28 per barrel |  |
Natural Gas (mcfe) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  |  |  |  |  |  |  |  |  | 2.59 per MMbtu |  |
Participation Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of business interest aqcuired | 33.00% |  |  |  |  |  |  |  |  |  |  |
Gross aquired (in acres) | a | 12,100 |  |  |  |  |  |  |  |  |  |  |
Net aquired (in acres) | a | 3,384 |  |  |  |  |  |  |  |  |  |  |
Transaction cost | $ 3,900 |  |  |  |  |  |  |  |  |  |  |
Participation Agreement [Member] | Farm-in Acreage [Member] |  |  |  |  |  |  |  |  |  |  |  |
Gross aquired (in acres) | a | 8,080 |  |  |  |  |  |  |  |  |  |  |
Net aquired (in acres) | a | 2,203 |  |  |  |  |  |  |  |  |  |  |
Participation Agreement [Member] | Primary Leasehold Acreage [Member] |  |  |  |  |  |  |  |  |  |  |  |
Gross aquired (in acres) | a | 4,020 |  |  |  |  |  |  |  |  |  |  |
Net aquired (in acres) | a | 1,181 |  |  |  |  |  |  |  |  |  |  |
Participation Agreement [Member] | Primary Leasehold Acreage [Member] | Well [Member] | 12.5% Carried Working Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |
Number of initial well | Number | 2 |  |  |  |  |  |  |  |  |  |  |
Number of drilled well | Number | 10 |  |  |  |  |  |  |  |  |  |  |
Participation Agreement [Member] | Primary Leasehold Acreage [Member] | Well [Member] | 12.5% Retained Working Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |
Number of drilled well | Number | 10 |  |  |  |  |  |  |  |  |  |  |
Percentage of project payout | 100.00% |  |  |  |  |  |  |  |  |  |  |
Participation Agreement [Member] | Primary Leasehold Acreage [Member] | Well [Member] | 25% Back-In Working Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of project payout | 115.00% |  |  |  |  |  |  |  |  |  |  |

X
- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligationCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination. + References No definition available. + Details
Name: | us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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 -Glossary Properties -URI http://asc.fasb.org/extlink&oid=21914647 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 -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61901-109447 + Details
Name: | us-gaap_CapitalizedCostsProvedProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions 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 -Glossary Properties -URI http://asc.fasb.org/extlink&oid=21914647 Reference 2: 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=51678428&loc=d3e61901-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -Glossary Unproved Properties -URI http://asc.fasb.org/extlink&oid=6527831 + Details
Name: | us-gaap_CapitalizedCostsUnprovedProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51678428&loc=SL6806780-109447 + Details
Name: | us-gaap_CapitalizedExploratoryWellCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of productive developmental wells drilled in the geographic area. A productive well is a well that is not a dry well. The number of wells drilled refers to the number of wells (holes) completed at any time during the fiscal years, regardless when drilling was initiated. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1205 -Paragraph (a) -Subparagraph (2) + Details
Name: | us-gaap_DevelopmentWellsDrilledNetProductive
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area spaced or assigned to productive wells in which a working interest is owned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
Name: | us-gaap_GasAndOilAreaDevelopedGross
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fractional interest owned based on working interests or other economic arrangements of area spaced or assigned to productive wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
Name: | us-gaap_GasAndOilAreaDevelopedNet
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- 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 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
Name: | us-gaap_ImpairmentOfOilAndGasProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
Name: | us-gaap_ProceedsFromLegalSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The unit of measure for reserve quantities. For example, barrels for oil reserves or cubic feet for natural gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61884-109447 + Details
Name: | us-gaap_ReservesUnitOfMeasure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents information pertaining to revenue recievable and account payable. + References No definition available. + Details
Name: | useg_AdjustmentsRelatedToRevenueReceivableAndAccountsPayable
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents capitalized costs transfer for unproved properties. + References No definition available. + Details
Name: | useg_CapitalizedCostsTransferredUnprovedProperties
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves. + References No definition available. + Details
Name: | useg_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties1
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents depreciation and amortization for per barrel oil production. + References No definition available. + Details
Name: | useg_DepreciationDepletionAmortizationPerBarrelOfOilEquivalentsBOE
Namespace Prefix: | useg_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents percentage of discount rate. + References No definition available. + Details
Name: | useg_DiscountRate
Namespace Prefix: | useg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents Net gross in acres. + References No definition available. + Details
Name: | useg_GasAndOilAreaDevelopedNetIncreaseDecrease
Namespace Prefix: | useg_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents number of well. + References No definition available. + Details
Name: | useg_NumberOfInitialWell
Namespace Prefix: | useg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents percentage of project costs. + References No definition available. + Details
Name: | useg_PercentageOfProjectCosts
Namespace Prefix: | useg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ReserveQuantitiesByTypeOfReserveAxis=us-gaap_OilReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReserveQuantitiesByTypeOfReserveAxis=us-gaap_NaturalGasReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=useg_ParticipationAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=useg_FarmInAcreageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=useg_PrimaryLeaseholdAcreageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=useg_WellMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | useg_InvestmentInterstAxis=useg_CarriedWorkingInterest12.5Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | useg_InvestmentInterstAxis=useg_RetainedWorkingInterest12.5Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | useg_InvestmentInterstAxis=useg_BackInWorkingInterest25Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |