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Note 3- Segment Reporting Information (Details) - Identifiable Assets by Segment (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Identifiable Assets:    
Identifiable Assets $ 174,198us-gaap_Assets $ 169,888us-gaap_Assets
Lighting Segment [Member]    
Identifiable Assets:    
Identifiable Assets 84,367us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= lyts_LightingSegmentMember		 93,847us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= lyts_LightingSegmentMember
Graphics Segment [Member]    
Identifiable Assets:    
Identifiable Assets 26,384us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= lyts_GraphicsSegmentMember		 24,425us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= lyts_GraphicsSegmentMember
Technology Segment [Member]    
Identifiable Assets:    
Identifiable Assets 31,081us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= lyts_TechnologySegmentMember		 33,440us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= lyts_TechnologySegmentMember
All Other Category [Member]    
Identifiable Assets:    
Identifiable Assets   2,860us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= lyts_AllOtherCategoryMember
Corporate and Eliminations [Member]    
Identifiable Assets:    
Identifiable Assets $ 32,366us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= lyts_CorporateAndEliminationsMember		 $ 15,316us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= lyts_CorporateAndEliminationsMember