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Shareholders Equity (USD $) In Thousands, except Share data | Common Stock USD ($) | Common Stock Shares | Additional Paid-In Capital USD ($) | Other Comprehensive Income / Loss USD ($) | Retained Earnings / Accumulated Deficit USD ($) | Treasury Stock USD ($) | Noncontrolling Interest USD ($) | Total USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2012 | $ 1,883us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | $ 173,794us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (620)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (97,878)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (7,658)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (65)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 73,456us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Beginning balance - shares at Dec. 31, 2012 |  | 18,828,734us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = ulbi_CommonStockSharesMember |  |  |  |  |  |
Shares issued to directors - amount | 2us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 71us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 73us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Shares issued to directors - shares |  | 19,845us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = ulbi_CommonStockSharesMember |  |  |  |  |  | 19,845us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
Shares issued on stock option exercise - amount |  |  | 12us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 12us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Shares issued on stock option exercise - shares |  | 3,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = ulbi_CommonStockSharesMember |  |  |  |  |  | (3,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Stock compensation - options |  |  | 774us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 774us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Stock compensation - restricted stock |  |  | 284ulbi_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 284ulbi_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockRequisiteServicePeriodRecognition
Foreign currency translation adjustments |  |  |  | 6us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | 6us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments
Vesting of restricted stock - amount |  |  |  |  |  |  |  | 0us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
Vesting of restricted stock - shares |  |  |  |  |  |  |  | 0us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits
Purchase of stock |  |  |  |  |  |  |  | 0us-gaap_TreasuryStockValueAcquiredCostMethod
Net loss |  |  |  |  | (926)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (34)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (960)us-gaap_ProfitLoss
Ending balance at Dec. 31, 2013 | 1,885us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 174,935us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (614)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (94,804)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (7,658)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (99)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 73,645us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Ending balance - shares at Dec. 31, 2013 |  | 18,851,579us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = ulbi_CommonStockSharesMember |  |  |  |  |  | 18,851,579us-gaap_CommonStockSharesIssued
Shares issued to directors - amount | 6us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 204us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 210us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Shares issued to directors - shares |  | 56,898us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = ulbi_CommonStockSharesMember |  |  |  |  |  | 56,898us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
Shares issued on stock option exercise - amount | 0us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 11us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 11us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Shares issued on stock option exercise - shares |  | 3,067us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = ulbi_CommonStockSharesMember |  |  |  |  |  | (3,067)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Stock compensation - options |  |  | 614us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 614us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Stock compensation - restricted stock |  |  | 179ulbi_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 179ulbi_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockRequisiteServicePeriodRecognition
Foreign currency translation adjustments |  |  |  | 147us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | 147us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments
Vesting of restricted stock - amount | 3us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (3)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 0us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
Vesting of restricted stock - shares |  | 30,000us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = ulbi_CommonStockSharesMember |  |  |  |  |  |
Purchase of stock |  |  |  |  |  | (762)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  | (762)us-gaap_TreasuryStockValueAcquiredCostMethod
Net loss |  |  |  |  | (2,116)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (15)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (2,131)us-gaap_ProfitLoss
Ending balance at Dec. 31, 2014 | $ 1,894us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | $ 175,940us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (467)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (96,920)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (8,420)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (114)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 71,913us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Ending balance - shares at Dec. 31, 2014 |  | 18,941,544us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = ulbi_CommonStockSharesMember |  |  |  |  |  | 18,941,544us-gaap_CommonStockSharesIssued

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