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Note 9 - 401(k) Retirement Benefit Plan (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Defined Contribution Plan, Employer Matching Contribution, As A Percentage Of Employee's Contribution | 50.00% |
Defined Contribution Plan, Maximum Employee Contribution Percentage Subject To Employer Matching Contribution | 4.00% |
Defined Contribution Plan, Employer Matching Contribution, Percent | 2.00% |
Defined Contribution Plan, Employer Discretionary Contribution Amount (in Dollars) | $ 243 | $ 381

X
- Definition Defined Contribution Plan, Employer Matching Contribution, As A Percentage Of Employee's Contribution + References No definition available. + Details
Name: | ulbi_DefinedContributionPlanEmployerMatchingContributionAsAPercentageOfEmployeesContribution
Namespace Prefix: | ulbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Maximum Employee Contribution Percentage Subject To Employer Matching Contribution + References No definition available. + Details
Name: | ulbi_DefinedContributionPlanMaximumEmployeeContributionPercentageSubjectToEmployerMatchingContribution
Namespace Prefix: | ulbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration