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Note 7 - Revolving Line of Credit and Long-term Debt - Debt (Details) (Parentheticals) - USD ($) $ in Thousands | Jun. 30, 2023 | Jun. 30, 2022
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Term Loan [Member] |  |
Debt Issuance Costs, Net | $ 21 | $ 30

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1D + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentAxis=lyts_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |