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Note 7 - Goodwill and Other Intangible Assets (Details) (USD $)
8 Months Ended
Mar. 02, 2015
Mar. 31, 2015
Jun. 30, 2014
Sep. 30, 2014
Note 7 - Goodwill and Other Intangible Assets (Details) [Line Items]        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill      
Indefinite-lived Intangible Assets Impairment Testing Value above Carrying Value 6,600,000lyts_IndefiniteLivedIntangibleAssetsImpairmentTestingValueAboveCarryingValue      
Indefinite-lived Intangible Assets Impairment Testing Percent Value above Carrying Value 192.00%lyts_IndefiniteLivedIntangibleAssetsImpairmentTestingPercentValueAboveCarryingValue      
Finite-Lived Intangible Assets, Gross   22,052,000us-gaap_FiniteLivedIntangibleAssetsGross 23,088,000us-gaap_FiniteLivedIntangibleAssetsGross  
Finite-Lived Intangible Assets, Accumulated Amortization   19,255,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 19,283,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Lighting Segment [Member]        
Note 7 - Goodwill and Other Intangible Assets (Details) [Line Items]        
Goodwill Impairment Testing, Value Above Carrying Value 36,200,000lyts_GoodwillImpairmentTestingValueAboveCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= lyts_LightingSegmentMember
     
Goodwill Impairment Testing, Percent Value Above Carrying Value 45.00%lyts_GoodwillImpairmentTestingPercentValueAboveCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= lyts_LightingSegmentMember
     
Graphics Segment [Member]        
Note 7 - Goodwill and Other Intangible Assets (Details) [Line Items]        
Goodwill Impairment Testing, Value Above Carrying Value 4,000,000lyts_GoodwillImpairmentTestingValueAboveCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= lyts_GraphicsSegmentMember
     
Goodwill Impairment Testing, Percent Value Above Carrying Value 344.00%lyts_GoodwillImpairmentTestingPercentValueAboveCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= lyts_GraphicsSegmentMember
     
Technology Segment [Member]        
Note 7 - Goodwill and Other Intangible Assets (Details) [Line Items]        
Goodwill Impairment Testing, Value Above Carrying Value 14,900,000lyts_GoodwillImpairmentTestingValueAboveCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= lyts_TechnologySegmentMember
     
Goodwill Impairment Testing, Percent Value Above Carrying Value 58.00%lyts_GoodwillImpairmentTestingPercentValueAboveCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= lyts_TechnologySegmentMember
     
LSI Saco [Member] | Customer Relationships [Member]        
Note 7 - Goodwill and Other Intangible Assets (Details) [Line Items]        
Finite-Lived Intangible Assets, Gross       1,036,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lyts_LSISacoMember
Finite-Lived Intangible Assets, Accumulated Amortization       428,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lyts_LSISacoMember
Customer Relationships [Member]        
Note 7 - Goodwill and Other Intangible Assets (Details) [Line Items]        
Finite-Lived Intangible Assets, Gross   9,316,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
10,352,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
 
Finite-Lived Intangible Assets, Accumulated Amortization   $ 7,216,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
$ 7,412,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember