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Note 13 - Sale of Subsidiary (Details) (USD $)
3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Sep. 30, 2014
Note 13 - Sale of Subsidiary (Details) [Line Items]            
Gain (Loss) on Disposition of Business     $ (565,000)us-gaap_GainLossOnSaleOfBusiness      
Revenue, Net 84,715,000us-gaap_SalesRevenueNet [1] 76,123,000us-gaap_SalesRevenueNet [1] 163,181,000us-gaap_SalesRevenueNet 156,609,000us-gaap_SalesRevenueNet    
Operating Income (Loss) 2,224,000us-gaap_OperatingIncomeLoss 1,511,000us-gaap_OperatingIncomeLoss 4,758,000us-gaap_OperatingIncomeLoss 4,350,000us-gaap_OperatingIncomeLoss    
LSI Saco Technologies Inc [Member]            
Note 13 - Sale of Subsidiary (Details) [Line Items]            
Sale of Stock, Consideration Received on Transaction         1,900,000us-gaap_SaleOfStockConsiderationReceivedOnTransaction
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lyts_LSISacoTechnologiesIncMember
 
Gain (Loss) on Disposition of Business         (565,000)us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lyts_LSISacoTechnologiesIncMember
 
Long-term Line of Credit         5,000,000us-gaap_LineOfCredit
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lyts_LSISacoTechnologiesIncMember
5,000,000us-gaap_LineOfCredit
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lyts_LSISacoTechnologiesIncMember
Revenue, Net           41,000us-gaap_SalesRevenueNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lyts_LSISacoTechnologiesIncMember
Operating Income (Loss)           $ (183,000)us-gaap_OperatingIncomeLoss
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= lyts_LSISacoTechnologiesIncMember
[1] Net sales are attributed to geographic areas based upon the location of the operation making the sale.