XML 42 R31.htm IDEA: XBRL DOCUMENT
v3.5.0.2

OIL PRICE RISK DERIVATIVES (Details Narrative) $ in Thousands | 3 Months Ended |
--- | --- | ---
Sep. 30, 2016 USD ($) Boe | Dec. 31, 2015 USD ($)
Call Contract [Member] |  |
Derivative contracts | $ 1 | $ 40
Put Contract [Member] |  |
Derivative contracts | $ 78 | 1,674
Wells Fargo [Member] |  |
Production of barrels of oil | Boe | 27,600 |
Price risk derivative | $ 77 | $ 1,634

X
- Definition Fair value of each cash settlement alternative for each freestanding option contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6445032&loc=d3e90205-114008 + Details
Name: | us-gaap_OptionIndexedToIssuersEquitySettlementAlternativesCashAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value as of the balance sheet date of all price risk derivatives designated as fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
Name: | us-gaap_PriceRiskFairValueHedgeDerivativeAtFairValueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Energy measure of oil and natural gas production reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 + Details
Name: | us-gaap_ProductionBarrelsOfOilEquivalents1
Namespace Prefix: | us-gaap_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_OptionIndexedToIssuersEquityTypeAxis=us-gaap_CallOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OptionIndexedToIssuersEquityTypeAxis=us-gaap_PutOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=useg_WellsFargoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |