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Note 5 - Commitments and Contingencies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2024 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	$ 752

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: