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STATEMENT OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Deficit [Member] | Unrealized Gain (Loss) on Marketable Securities [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 274 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 122,523 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 3,906 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 78 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | $ 126,781 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2011 | 27,409,908 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (11,245)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (11,245)us-gaap_NetIncomeLoss
Recognized gain on marketable securities | 0 us-gaap_MarketableSecuritiesRealizedGainLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_MarketableSecuritiesRealizedGainLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_MarketableSecuritiesRealizedGainLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (54)us-gaap_MarketableSecuritiesRealizedGainLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (54)us-gaap_MarketableSecuritiesRealizedGainLoss
Unrecognized loss on marketable securities | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 90 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 90 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Unrealized tax effect on the unrealized gain | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (13)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (13)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Funding of ESOP | 2 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 241 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 243 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan
Funding of ESOP (in shares) | 161,624 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of common stock 2001 stock compensation plan | 1 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 162 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 163 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Issuance of common stock 2001 stock compensation plan (in shares) | 60,000 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of common stock from stock options | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Issuance of common stock from stock options (in shares) | 1,070 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of common stock from stock warrants | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 50 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 50 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
Issuance of common stock from stock warrants (in shares) | 20,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Vesting of stock options | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 33 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 33 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested
Vesting of stock warrants | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 69 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 69 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested
Balance at Dec. 31, 2012 | 277 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 123,078 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (7,339)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 101 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 116,117 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2012 | 27,652,602 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (7,379)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (7,379)us-gaap_NetIncomeLoss
Unrecognized loss on marketable securities | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (113)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (113)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Funding of ESOP | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 200 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 200 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan
Funding of ESOP (in shares) | 53,276 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of common stock 2001 stock compensation plan | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 48 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 48 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Issuance of common stock 2001 stock compensation plan (in shares) | 30,000 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Vesting of stock options | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 120 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 120 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested
Vesting of stock warrants | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 64 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 64 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested
Balance at Dec. 31, 2013 | 277 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 123,510 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (14,718)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (12)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 109,057 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2013 | 27,735,878 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (2,091)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (2,091)us-gaap_NetIncomeLoss
Unrecognized loss on marketable securities | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (44)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (44)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Funding of ESOP | 1 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 208 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 209 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan
Funding of ESOP (in shares) | 141,721 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of common stock from stock options | 2 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (64)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (62)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Issuance of common stock from stock options (in shares) | 157,950 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of common stock from stock warrants | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 8 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 8 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
Issuance of common stock from stock warrants (in shares) | 12,112 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Vesting of stock options | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 229 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 229 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsVested
Vesting of stock warrants | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 89 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 89 useg_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockWarrantsVested
Balance at Dec. 31, 2014 | $ 280 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 123,980 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (16,809)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (56)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | $ 107,395 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2014 | 28,047,661 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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