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Note 2 - Identifiable Assets by Segment (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2012
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Lighting Segment [Member] |  |  |  |  |
Identifiable Assets: |  |  |  |  |
Identifiable Assets | $ 95,168 | $ 90,713 |  |  |
Graphics Segment [Member] |  |  |  |  |
Identifiable Assets: |  |  |  |  |
Identifiable Assets | 32,450 | 29,477 |  |  |
Technology Segment [Member] |  |  |  |  |
Identifiable Assets: |  |  |  |  |
Identifiable Assets | 29,388 | 28,423 |  |  |
All Other Category [Member] |  |  |  |  |
Identifiable Assets: |  |  |  |  |
Identifiable Assets |  |  |  |  |
Corporate and Eliminations [Member] |  |  |  |  |
Identifiable Assets: |  |  |  |  |
Identifiable Assets | 38,554 | 32,077 |  |  |
Identifiable Assets | $ 195,560 | $ 180,690 | $ 168,688 | $ 169,179 | $ 175,226

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lyts_LightingSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lyts_GraphicsSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lyts_TechnologySegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lyts_AllOtherCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |