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v3.26.1

Note 8 - Commitments and Contingencies (Details Textual) $ in Thousands | 6 Months Ended
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Jun. 30, 2026 USD ($)
Capital Addition Purchase Commitments [Member] |
Long-Term Purchase Commitment, Amount | $ 301

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

X
- Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=ulbi_CapitalAdditionPurchaseCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |