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Note 12 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Revenues	$ 23,069	$ 22,035
Revenue, percentage
Commercial [Member]
Revenues	$ 14,988	$ 13,890
Revenue, percentage	65.00%	63.00%
Government & Defense [Member]
Revenues	$ 8,081	$ 8,145
Revenue, percentage	35.00%	37.00%
Battery & Energy Products Segment [Member]
Revenues	$ 17,224	$ 17,479
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues	9,415	9,422
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues	7,809	8,057
Communications Systems Segment [Member]
Revenues	5,845	4,556
Communications Systems Segment [Member] | Commercial [Member]
Revenues	5,573	4,468
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues	$ 272	$ 88

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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- Details

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X

- Details

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