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Note 13 - Recent Accounting Pronouncements and Developments (Details Textual) $ in Thousands	3 Months Ended
	Apr. 02, 2017 USD ($)
Reclassification of Current Deferred Tax Assets to Noncurrent [Member]
Current Period Reclassification Adjustment	$ 94
Reclassification of Current Deferred Tax Assets to Noncurrent [Member] | December 31, 2016 [Member]
Prior Period Reclassification Adjustment	94
Accounting Standards Update 2016-09 [Member]
Deferred Tax Assets, Gross	1,200
Deferred Tax Assets, Valuation Allowance	$ 1,200

X

- Definition

The amount of a reclassification adjustment made to current period financial statement amounts.

+ References

No definition available.

+ Details

Name:	ulbi_CurrentPeriodReclassificationAdjustment
Namespace Prefix:	ulbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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X

- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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X

- Details

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