XML 65 R46.htm IDEA: XBRL DOCUMENT
v3.3.1.900

OIL AND GAS PRODUCING ACTIVITIES (Details 1) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Unproved leasehold costs | $ 5,664 | $ 10,188
Unproved Properties Capitalized Costs 2011 [Member] |  |
Unproved leasehold costs | 2,686 | 4,015
Unproved Properties Capitalized Costs 2012 [Member] |  |
Unproved leasehold costs | 267 | 271
Unproved Properties Capitalized Costs 2013 [Member] |  |
Unproved leasehold costs | 1,525 | 2,067
Unproved Properties Capitalized Costs 2014 [Member] |  |
Unproved leasehold costs | 1,153 | $ 3,732
Unproved Properties Capitalized Costs 2015 [Member] |  |
Unproved leasehold costs | $ 33 |
Unproved Properties Capitalized Costs 2010 [Member] |  |
Unproved leasehold costs |  | $ 103

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
- Details
Name: | us-gaap_AgingOfCapitalizedExploratoryWellCostsAxis=us-gaap_AgingOfCapitalizedExploratoryWellCostsPeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AgingOfCapitalizedExploratoryWellCostsAxis=us-gaap_AgingOfCapitalizedExploratoryWellCostsPeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AgingOfCapitalizedExploratoryWellCostsAxis=us-gaap_AgingOfCapitalizedExploratoryWellCostsPeriodThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AgingOfCapitalizedExploratoryWellCostsAxis=us-gaap_AgingOfCapitalizedExploratoryWellCostsPeriodFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AgingOfCapitalizedExploratoryWellCostsAxis=us-gaap_AgingOfCapitalizedExploratoryWellCostsPeriodFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AgingOfCapitalizedExploratoryWellCostsAxis=useg_AgingOfCapitalizedExploratoryWellCostsPeriodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |