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Note 1 - Basis of Presentation (Details Textual) $ in Thousands | Sep. 30, 2023 USD ($)
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Employee Retention Credit (ERC) [Member] |
Government Assistance, Amount, Cumulative, Current | $ 1,544

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- Definition Amount of cumulative government assistance recognized classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 832 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483507/832-10-50-3 + Details
Name: | us-gaap_GovernmentAssistanceAmountCumulativeCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_GovernmentAssistanceTypeAxis=ulbi_EmployeeRetentionCreditERCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |