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Note 10 - Earnings Per Share (Details Textual) - shares	3 Months Ended		6 Months Ended
	Jun. 26, 2016	Jun. 28, 2015	Jun. 26, 2016	Jun. 28, 2015
Dilutive Securities Included in Computation of Earnings Per Share Amount	1,144,076	358,034	1,177,076	257,534
Dilutive Securities Included in Computation of Earnings Per Share Amount Restricted Stock	32,800	34,200	32,800	34,200
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	160,732	39,426	255,479	31,903
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	996,583	1,904,922	963,583	2,005,422

X

- Definition

Number of employee stock options included in calculation of diluted earnings per share.

+ References

No definition available.

+ Details

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Namespace Prefix:	ulbi_
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Balance Type:	na
Period Type:	duration

X

- Definition

Number of restricted shares included in calculation of diluted earnings per share.

+ References

No definition available.

+ Details

Name:	ulbi_DilutiveSecuritiesIncludedInComputationOfEarningsPerShareAmountRestrictedStock
Namespace Prefix:	ulbi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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Period Type:	duration

X

- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 28A
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1500-109256

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Period Type:	duration