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Note 9 - Cash Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Aug. 31, 2024
Payments of Dividends | $ 5.7 | $ 5.4 |
Dividends Accrued | $ 0.1 | $ 0.1 |
Subsequent Event [Member] |  |  |
Quarterly Indicated Per Share Dividend Rate |  |  | $ 0.05

X
- Definition Dividends declared but unpaid on equity securities issued by the entity during the period. + References No definition available. + Details
Name: | lyts_DividendsAccrued
Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The indicated per share quarterly cash dividend rate. + References No definition available. + Details
Name: | lyts_QuarterlyIndicatedPerShareDividendRate
Namespace Prefix: | lyts_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
Name: | us-gaap_PaymentsOfDividends
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |