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SHAREHOLDERS' EQUITY, Employee Stock Ownership Plan (Details) (1989 Employee Stock Ownership Plan [Member], USD $) | 12 Months Ended
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Dec. 31, 2014 H | Dec. 31, 2013 | Dec. 31, 2012
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Term of eligibility | 1 year |  |
Minimum hours required in the term of service for eligibility | 1,000 useg_EmployeeStockOwnershipPlanEsopMinimumHoursRequiredInTermOfServiceForEligibility |  |
Initial vesting percentage (in hundredths) | 20.00%useg_EmployeeStockOwnershipPlanEsopInitialVestingPercentage |  |
Vesting period | 3 years |  |
Annual vesting percentage (in hundredths) | 20.00%useg_EmployeeStockOwnershipPlanEsopAnnualVestingPercentage |  |
Service period requirement to be Fully Vested | 7 years |  |
Maximum employee's total compensation paid as basis for contribution into ESOP | $ 260,000 useg_EmployeeStockOwnershipPlanEsopTotalCompensationPaidAsBasisForContributionIntoEsopMaximum | $ 255,000 useg_EmployeeStockOwnershipPlanEsopTotalCompensationPaidAsBasisForContributionIntoEsopMaximum | $ 250,000 useg_EmployeeStockOwnershipPlanEsopTotalCompensationPaidAsBasisForContributionIntoEsopMaximum
Shares contributed to ESOP (in shares) | 141,721 us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP | 53,276 us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP | 161,624 us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP
Share price of shares included in ESOP (in dollars per share) | $ 1.48 us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased | $ 3.76 us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased | $ 1.50 us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased
ESOP contribution expense | $ 209,000 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense | $ 200,000 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense | $ 243,000 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense
Minimum [Member] |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
ESOP funding percentages (in hundredths) | 10.00%useg_EsopFundingPercentages / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = useg_EmployeeStockOwnershipPlan1989Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
ESOP funding percentages (in hundredths) | 15.00%useg_EsopFundingPercentages / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = useg_EmployeeStockOwnershipPlan1989Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition The annual vesting percentage after minimum years of service for the Employee Stock Ownership Plan (ESOP). + References No definition available. + Details
Name: | useg_EmployeeStockOwnershipPlanEsopAnnualVestingPercentage
Namespace Prefix: | useg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The vesting percentage in the required service period in the Employee Stock Ownership Plan (ESOP). + References No definition available. + Details
Name: | useg_EmployeeStockOwnershipPlanEsopInitialVestingPercentage
Namespace Prefix: | useg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The minimum number of hours that must be worked in the minimum term for eligibility in the ESOP. + References No definition available. + Details
Name: | useg_EmployeeStockOwnershipPlanEsopMinimumHoursRequiredInTermOfServiceForEligibility
Namespace Prefix: | useg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The service period requirement for vesting schedule. + References No definition available. + Details
Name: | useg_EmployeeStockOwnershipPlanEsopServicePeriodRequirementForVestingSchedule
Namespace Prefix: | useg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The service period requirement to be fully vested. + References No definition available. + Details
Name: | useg_EmployeeStockOwnershipPlanEsopServicePeriodRequirementToBeFullyVested
Namespace Prefix: | useg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The period of time in which the employee must be in services before becoming eligible for the Employee Stock Ownership Plan (ESOP). + References No definition available. + Details
Name: | useg_EmployeeStockOwnershipPlanEsopTermOfEligibility
Namespace Prefix: | useg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum amount of employee's total compensation paid, which is the basis for computing how much of the total annual funding is contributed into his or her personal account. + References No definition available. + Details
Name: | useg_EmployeeStockOwnershipPlanEsopTotalCompensationPaidAsBasisForContributionIntoEsopMaximum
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The ESOP funding percentages during the period. + References No definition available. + Details
Name: | useg_EsopFundingPercentages
Namespace Prefix: | useg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Weighted average purchase price of capital shares purchased through an employee stock ownership plan. + References No definition available. + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration