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Note 16 - Related Party Transactions (Details) - Expenses from Related Party Transactions - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2013
Keating Muething and Klekamp PLL [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | $ 500 | $ 98 | $ 84
American Engineering and Metal Working [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | 300 | 215 | 394
Canada Inc 3970957 [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | 42 | 161 | 182
Synergy Electronic LTD [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | $ 7 | $ 171 | $ 232

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=lyts_AmericanEngineeringAndMetalWorkingMember
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Data Type: | na
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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=lyts_CanadaInc3970957Member
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Data Type: | na
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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=lyts_SynergyElectronicLTDMember
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