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Note 8 - Goodwill and Other Intangible Assets (Details Textual) | 3 Months Ended
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Sep. 30, 2025
Number of Reporting Units | 5
Lighting Segment [Member] |
Number of Reporting Units | 1
Display Solutions Segment [Member] |
Number of Reporting Units | 4

X
- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References No definition available. + Details
Name: | us-gaap_NumberOfReportingUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lyts_LightingSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lyts_DisplaySolutionsSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |