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Note 2 - Share Repurchase Program (Details Narrative) (USD $)	3 Months Ended	12 Months Ended		24 Months Ended
	Mar. 29, 2015	Apr. 30, 2016	Apr. 29, 2015	Apr. 30, 2016
Note 2 - Share Repurchase Program Details Narrative
Maximum number of shares the Company is authorized to repurchase		1,800,000ULBI_StockRepurchasePlanSharesAuthorizedToBeRepurchased		1,800,000ULBI_StockRepurchasePlanSharesAuthorizedToBeRepurchased
Shares repurchased	78,401us-gaap_StockRepurchasedDuringPeriodShares		388,122us-gaap_StockRepurchasedDuringPeriodShares
Cost of shares repurchased	$ 298,000us-gaap_StockRepurchasedDuringPeriodValue		$ 1,387,000us-gaap_StockRepurchasedDuringPeriodValue

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Namespace Prefix:	ULBI_
Data Type:	xbrli:stringItemType
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X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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Namespace Prefix:	ULBI_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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Balance Type:	na
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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

+ Details

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Balance Type:	debit
Period Type:	duration