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Note 14 - Fire at Manufacturing Facility (Detail) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Apr. 30, 2013	Jun. 30, 2011	Mar. 27, 2016
Extraordinary and Unusual Items [Abstract]
Business Interruption Loss, Gross		$ 1,589
Proceeds from Insurance Settlement, Operating Activities	$ 1,286
Gain on Business Interruption Insurance Recovery	$ 0
Insurance Settlements Receivable			$ 177
Business Interruption, Insurance Deductible			$ 126

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

- References

No definition available.

+ Details

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

X

- 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

Name:	us-gaap_GainOnBusinessInterruptionInsuranceRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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=56944662&loc=d3e3337-108585

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Namespace Prefix:	us-gaap_
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