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Note 7 - Shareholders' Equity (Details) - Restricted Stock Values (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Restricted Stock Values [Abstract]
Number of shares award	120,000
Weighted average fair value per share	$ 3.62
Aggregate total value	$ 434

X

- Definition

Aggregate total value restricted stock.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ulbi_RestrictedStockValuesAbstract
Namespace Prefix:	ulbi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average fair value per share restricted stock.

+ References

No definition available.

+ Details

Name:	ulbi_WeightedAverageFairValuePerShareRestrictedStock
Namespace Prefix:	ulbi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration