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Note 10 - Earnings Per Share (Details Textual) - shares	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Dilutive Securities Included in Computation of Earnings Per Share Amount	1,268,286	1,055,097	1,254,286	1,055,097
Dilutive Securities Included in Computation of Earnings Per Share Amount Restricted Stock	17,500	13,400	17,500	13,400
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total	598,061	339,705	540,836	291,062
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	401,750	1,060,916	415,750	1,060,916

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

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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://fasb.org/us-gaap/role/ref/legacyRef
-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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 28A
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1500-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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