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Note 11 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Apr. 01, 2018
Revenues	[1]	$ 18,882	$ 23,069
Revenue, percentage	[1]
UNITED STATES
Revenues	[1]	$ 10,021	$ 14,988
Revenue, percentage	[1]	53.00%	65.00%
Non-US [Member]
Revenues	[1]	$ 8,861	$ 8,081
Revenue, percentage	[1]	47.00%	35.00%
Battery & Energy Products Segment [Member]
Revenues	[1]	$ 15,998	$ 17,224
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	[1]	7,567	9,415
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	[1]	8,431	7,809
Communications Systems Segment [Member]
Revenues	[1]	2,884	5,845
Communications Systems Segment [Member] | UNITED STATES
Revenues	[1]	2,454	5,573
Communications Systems Segment [Member] | Non-US [Member]
Revenues	[1]	$ 430	$ 272
[1] Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects

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
Period Type:	duration

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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: