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Note 13 - Fire at Manufacturing Facility (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2012 | Jul. 03, 2011 | Jun. 30, 2013
Extraordinary and Unusual Items [Abstract] |  |  |
Business Interruption Loss, Gross |  | $ 1,589 |
Proceeds from Insurance Settlement, Operating Activities | 1,017 |  | 269
Insurance Settlements Receivable |  |  | 165
Business Interruption, Insurance Deductible |  |  | $ 132

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

X
- 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

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

X
- 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
Name: | us-gaap_InsuranceSettlementsReceivable
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