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Note 6 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 14, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Gain (Loss) Related to Litigation Settlement, Total |  | $ 1,593 | $ (0)
Capital Addition Purchase Commitments [Member] |  |  |
Long-term Purchase Commitment, Amount |  | $ 873 |
Lithium Ion Batteries Antitrust Litigation [Member] |  |  |
Litigation Settlement, Amount Awarded from Other Party | $ 1,593 |  |
Gain (Loss) Related to Litigation Settlement, Total | $ 1,593 |  |

X
- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount awarded from other party in judgment or settlement of litigation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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X
- Details
Name: | srt_LitigationCaseAxis=ulbi_LithiumIonBatteriesAntitrustLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |