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Note 16 - Income Taxes (Details Textual) $ in Millions | 3 Months Ended
--- | ---
Sep. 30, 2020 USD ($)
Income Tax Benefit Cares Act | $ 0.4

X
- Definition Amount of income tax benefit related to the CARES Act. + References No definition available. + Details
Name: | lyts_IncomeTaxBenefitCaresAct
Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration