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Note 12 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Revenues	$ 23,069	$ 22,035
Revenue, percentage
UNITED STATES
Revenues	$ 9,626	$ 9,351
Revenue, percentage	42.00%	42.00%
Non-US [Member]
Revenues	$ 13,443	$ 12,684
Revenue, percentage	58.00%	58.00%
Battery & Energy Products Segment [Member]
Revenues	$ 17,224	$ 17,479
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	9,626	9,351
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	7,598	8,128
Communications Systems Segment [Member]
Revenues	5,845	4,556
Communications Systems Segment [Member] | UNITED STATES
Revenues
Communications Systems Segment [Member] | Non-US [Member]
Revenues	$ 5,845	$ 4,556

X

- Definition

The percentage of total revenue for the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	ulbi_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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Period Type:

X

- Details

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Data Type:	na
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Period Type:

X

- Details

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Period Type:

X

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Period Type: