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Note 11 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenue	$ 85,531	$ 82,460
Revenue, percentage
Commercial [Member]
Revenue	$ 40,790	$ 40,886
Revenue, percentage	48.00%	50.00%
Government & Defense [Member]
Revenue	$ 44,741	$ 41,574
Revenue, percentage	52.00%	50.00%
Battery & Energy Products Segment [Member]
Revenue	$ 69,789	$ 64,753
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenue	40,790	40,886
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenue	28,999	23,867
Communications Systems Segment [Member]
Revenue	15,742	17,707
Communications Systems Segment [Member] | Commercial [Member]
Revenue
Communications Systems Segment [Member] | Government & Defense [Member]
Revenue	$ 15,742	$ 17,707

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 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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X

- Details

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X

- Details

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Period Type:

X

- Details

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X

- Details

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