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Note 5 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Dec. 14, 2020	Dec. 31, 2021	Dec. 31, 2020
Gain (Loss) Related to Litigation Settlement, Total		$ (0)	$ 1,593
Capital Addition Purchase Commitments [Member]
Long-term Purchase Commitment, Amount		$ 630
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

X

- Definition

Amount awarded from other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedFromOtherParty
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

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:

X

- Details

Name:	srt_LitigationCaseAxis=ulbi_LithiumIonBatteriesAntitrustLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: