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Note 10 - Earnings Per Share (Details Textual) - shares	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016
Dilutive Securities Included in Computation of Earnings Per Share Amount	1,481,844	758,953	1,066,844	1,139,843
Dilutive Securities Included in Computation of Earnings Per Share Amount Restricted Stock	0	15,900	0	15,900
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	407,668	91,041	323,217	184,564
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	569,000	1,733,083	984,000	1,351,833

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_
Data Type:	xbrli:sharesItemType
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
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

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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=96947427&loc=d3e1500-109256

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