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Note 17 - Related Party Transactions (Tables) | 12 Months Ended
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Jun. 30, 2021
Notes Tables |
Schedule of Related Party Revenue [Table Text Block] |
(In thousands) |  | 2021 |  |  | 2020 |
Wesco International |  | $ | 2,013 |  |  | $ | 1,575 |
Schedule of Related Party Assets [Table Text Block] |
(In thousands) |  | 2021 |  |  | 2020 |
Wesco International |  | $ | 264 |  |  | $ | 108 |

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- Definition Tabular disclosure of related party assets. + References No definition available. + Details
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Namespace Prefix: | lyts_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of related party revenue. + References No definition available. + Details
Name: | lyts_ScheduleofRelatedPartyRevenueTableTextBlock
Namespace Prefix: | lyts_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration