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Note 17 - Acquisition - Pro Forma Financial Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Net Sales | $ 366,541 | $ 381,650
Gross Profit | 95,038 | 105,592
Operating Income | $ 6,857 | $ 18,010

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- Definition The pro forma gross profit for a period as if the business combination or combinations had been completed at the beginning of the period. + References No definition available. + Details
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Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount before tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period. + References No definition available. + Details
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Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration