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Note 6 - Goodwill, Intangible Assets and Long Term Assets Goodwill Activity (Details) (USD $)	3 Months Ended		9 Months Ended
	Mar. 29, 2015	Mar. 30, 2014	Dec. 31, 2014
Goodwill - beginning	$ 16,407,000us-gaap_Goodwill	$ 16,419,000us-gaap_Goodwill	$ 16,399,000us-gaap_Goodwill
Effect of foreign currency translation	9,000us-gaap_GoodwillTranslationAdjustments	(20,000)us-gaap_GoodwillTranslationAdjustments	8,000us-gaap_GoodwillTranslationAdjustments
Goodwill - ending	16,416,000us-gaap_Goodwill	16,399,000us-gaap_Goodwill	16,407,000us-gaap_Goodwill
Battery & Energy Products
Goodwill - beginning	4,914,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ULBI_BatteryMember	4,926,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ULBI_BatteryMember	4,906,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ULBI_BatteryMember
Effect of foreign currency translation	9,000us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ULBI_BatteryMember	(20,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ULBI_BatteryMember	8,000us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ULBI_BatteryMember
Goodwill - ending	4,923,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ULBI_BatteryMember	4,906,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ULBI_BatteryMember	4,914,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ULBI_BatteryMember
Communications Systems
Goodwill - beginning	11,493,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ULBI_CommsMember	11,493,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ULBI_CommsMember	11,493,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ULBI_CommsMember
Effect of foreign currency translation	0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ULBI_CommsMember	0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ULBI_CommsMember	0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ULBI_CommsMember
Goodwill - ending	$ 11,493,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ULBI_CommsMember	$ 11,493,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ULBI_CommsMember	$ 11,493,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ULBI_CommsMember

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ULBI_BatteryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ULBI_CommsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: