XML 46 R33.htm IDEA: XBRL DOCUMENT
v3.5.0.2

DISCONTINUED OPERATIONS (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Assets retained by the Company: |  |
Performance bonds and refundable deposits | $ 135 | $ 114
Net assets conveyed to Purchaser: |  |
Undeveloped mining claims |  | 21,942
Mining equipment |  | 1,774
Less accumulated depreciation of mining equipment |  | (892)
Less write-down due to impairment |  | (22,620)
Net book value of assets conveyed |  | 204
Total assets of discontinued operations | 135 | 318
Asset retirement obligations assumed by Purchaser |  | $ 204

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: 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=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents information pertaining to accumulated depreciation of mining equipment. + References No definition available. + Details
Name: | useg_AccumulatedDepreciationOfMiningEquipment
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 No definition available. + Details
Name: | useg_AssetRetirementObligationCurrent1
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents information about the assets of discontinued operations. + References No definition available. + Details
Name: | useg_AssetsOfDiscontinuedOperations
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | useg_AssetsRetainedByTheCompanyAbstract
Namespace Prefix: | useg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. + References No definition available. + Details
Name: | useg_GainLossOnSalesOfAssetsAndAssetImpairmentCharges1
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents information pertaining to Mining equipment. + References No definition available. + Details
Name: | useg_MiningEquipment
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | useg_NetAssetsConveyedToPurchaserAbstract
Namespace Prefix: | useg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents information pertaining to performance bonds. + References No definition available. + Details
Name: | useg_PerformanceBonds
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents information pertaining to Undeveloped mining claims. + References No definition available. + Details
Name: | useg_UndevelopedMiningClaims
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration