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Note 5 - Property, Equipment and Improvements (Details Narrative) (USD $)	3 Months Ended
	Mar. 29, 2015	Mar. 30, 2014
Note 5 - Property Equipment And Improvements Details Narrative
Depreciation expense	$ 596,000us-gaap_Depreciation	$ 666,000us-gaap_Depreciation

X

- Details

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Namespace Prefix:	ULBI_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ 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

+ Details

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