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Note 8 - Commitments and Contingencies (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Capital Addition Purchase Commitments [Member]
Long-Term Purchase Commitment, Amount	$ 873

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: