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Note 6 - Supplemental Balance Sheet Information - Acquisition (Details) - SWE [Member] $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($)
Estimated Fair Value | $ 3,649
Annual Estimated Amortization Expense | 243
Customer Relationships [Member] |
Estimated Fair Value | 2,522
Annual Estimated Amortization Expense | 168
Trade Names [Member] |
Estimated Fair Value | 1,127
Annual Estimated Amortization Expense | $ 75
Estimate Useful Lives (Year) | 15 years

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- Definition The annual estimate amortization expense of identifiable intangible assets recognized as of the acquisition date. + References No definition available. + Details
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Namespace Prefix: | ulbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=ulbi_SWEMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |