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Note 11 - Fire at Manufacturing Facility (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2013 | Jun. 30, 2011 | Dec. 31, 2014
Extraordinary and Unusual Items [Abstract] |  |  |
Business Interruption Loss, Gross |  | $ 1,589ulbi_BusinessInterruptionLossGross |
Proceeds from Insurance Settlement, Operating Activities | 1,286us-gaap_ProceedsFromInsuranceSettlementOperatingActivities |  |
Gain on Business Interruption Insurance Recovery | 0us-gaap_GainOnBusinessInterruptionInsuranceRecovery |  |
Insurance Settlements Receivable |  |  | 184us-gaap_InsuranceSettlementsReceivable
Business Interruption, Insurance Deductible |  |  | $ 132ulbi_BusinessInterruptionInsuranceDeductible

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- Definition Business Interruption, Insurance Deductible + References No definition available. + Details
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Namespace Prefix: | ulbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Business Interruption Loss, Gross + References No definition available. + Details
Name: | ulbi_BusinessInterruptionLossGross
Namespace Prefix: | ulbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6365675&loc=d3e16285-107787 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to operating activities. It excludes insurance settlements classified as investing cash flows, for example, insurance settlements related to fixed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3337-108585 + Details
Name: | us-gaap_ProceedsFromInsuranceSettlementOperatingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration