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Note 9 - 401k Retirement Benefit Plan (Details Narrative) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Note 9 - 401k Retirement Benefit Plan Details Narrative |  |
Defined Contribution Plan, Employer Matching Contribution, As A Percentage Of Employee's Contribution | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch |
Defined Contribution Plan, Maximum Employee Contribution Percentage Subject To Employer Matching Contribution | 4.00%ulbi_DefinedContributionPlanMaximumEmployeeContributionPercentageSubjectToEmployerMatchingContribution |
Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. | 2.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |
Employer discretionary contribution | $ 164us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 99us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | ulbi_DefinedContributionPlanMaximumEmployeeContributionPercentageSubjectToEmployerMatchingContribution
Namespace Prefix: | ulbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ulbi_Note9401kRetirementBenefitPlanDetailsNarrativeAbstract
Namespace Prefix: | ulbi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration