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Note 9 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Revenues, Total	[1]	$ 87,190	$ 85,531
Revenue, percentage	[1]
Commercial [Member]
Revenues, Total		$ 41,044	$ 40,790
Revenue, percentage		47.00%	48.00%
Government & Defense [Member]
Revenues, Total		$ 46,146	$ 44,741
Revenue, percentage		53.00%	52.00%
Battery & Energy Products Segment [Member]
Revenues, Total	[1]	$ 70,497	$ 69,789
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues, Total		41,044	40,790
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues, Total		29,453	28,999
Communications Systems Segment [Member]
Revenues, Total	[1]	16,693	15,742
Communications Systems Segment [Member] | Commercial [Member]
Revenues, Total
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues, Total		$ 16,693	$ 15,742
[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_
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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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