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Note 3 - Segment Reporting Information - Intersegment Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Inter-segment Revenues | $ 87,466 | $ 84,159
Lighting Segment [Member] |  |
Inter-segment Revenues | 68,428 | 65,265
Graphics Segment [Member] |  |
Inter-segment Revenues | 19,038 | 18,894
Intersegment Eliminations [Member] | Lighting Segment [Member] |  |
Inter-segment Revenues | 715 | 753
Intersegment Eliminations [Member] | Graphics Segment [Member] |  |
Inter-segment Revenues | $ 31 | $ 132

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesRevenueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |