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Note 6 - Goodwill, Intangible Assets and Long Term Assets Composition of Intangible Assets (Details) (USD $)	3 Months Ended
	Mar. 29, 2015	Mar. 30, 2014
Amortization expense	$ 60,000us-gaap_AmortizationOfIntangibleAssets	$ 74,000us-gaap_AmortizationOfIntangibleAssets
Research and Development Expense
Amortization expense	42,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchMember	32,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchMember
Selling, General and Administrative Expenses
Amortization expense	$ 32,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_IncomeStatementLocationAxis = ULBI_SGAMember	$ 28,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_IncomeStatementLocationAxis = ULBI_SGAMember

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: