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Note 2 - Dispositions, Relocations and Exit Activities - New Lease (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Note 2 - Dispositions Relocations And Exit Activities - New Lease Details    
New lease term   5 years
Number of rent-free months   2 months
Monthly rent payments - RMB - first three years   $ 117ulbi_OperatingLeaseMonthlyRentinRMBFirstThreeYears
Monthly rent payments - RMB - last two years   126ulbi_OperatingLeaseMonthlyRentinRMBLastTwoYears
Monthly rent payments - first three years   19ulbi_OperatingLeaseMonthlyRentFirstThreeYears
Monthly rent payments - last two years   20ulbi_OperatingLeaseMonthlyRentLastTwoYears
Government reimbursement received - China factory move   815ulbi_GovernmentGrantReimbursementCashReceivedInConnectionWithChinaFactoryMove
Total estimated expenses of China factory move   1,060ulbi_EstimatedExpensesInConnectionWithChinaFactoryMove
Government reimbursement recognized - China factory move   596ulbi_GovernmentGrantReimbursementRevenueRecognizedAsReductionofExpenseInConnectionWithChinaFactoryMove
Expenses recognized - China factory move   840ulbi_ExpensesRecognizedInConnectionWithChinaFactoryMove
Estimated expenses to be incurred - China factory move 219ulbi_EstimatedExpensesRemainingToBeRecognizedInConnectionWithChinaFactoryMove  
Estimated revenue to be recognized - China move $ 219ulbi_EstimatedRevenueRemainingToBeRecognizedInConnectionWithChinaFactoryMove