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Note 4 - Commitments and Contingencies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($)
Minimum [Member] |
Standard Product Warranty, Period | 90 days
Maximum [Member] |
Standard Product Warranty, Period | 3 years
Capital Addition Purchase Commitments [Member] |
Long-Term Purchase Commitment, Amount | $ 890

X
- Definition Period for standard product warranty. + References No definition available. + Details
Name: | ulbi_StandardProductWarrantyPeriod
Namespace Prefix: | ulbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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