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Note 9 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Revenues, Total	[1]	$ 87,190	$ 85,531
Revenue, percentage	[1]
UNITED STATES
Revenues, Total	[1]	$ 53,054	$ 47,614
Revenue, percentage	[1]	61.00%	56.00%
Non-US [Member]
Revenues, Total	[1]	$ 34,136	$ 37,917
Revenue, percentage	[1]	39.00%	44.00%
Battery & Energy Products Segment [Member]
Revenues, Total	[1]	$ 70,497	$ 69,789
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues, Total	[1]	37,898	33,397
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues, Total	[1]	32,599	36,392
Communications Systems Segment [Member]
Revenues, Total	[1]	16,693	15,742
Communications Systems Segment [Member] | UNITED STATES
Revenues, Total	[1]	15,156	14,217
Communications Systems Segment [Member] | Non-US [Member]
Revenues, Total	[1]	$ 1,537	$ 1,525
[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
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X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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X

- Details

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