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Note 3 - Long-lived Assets by Geographical Region (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Jun. 30, 2015
--- | --- | ---
UNITED STATES |  |  |
Long-lived Assets (b): |  |  |
Long-Lived Assets | [1] | $ 45,395 | $ 44,965
Long-Lived Assets | [1] | $ 45,395 | $ 44,965
[1] | Long-lived assets include property, plant and equipment, and other long-term assets. Goodwill and intangible assets are not included in long-lived assets.

X
- Definition Long-lived assets other than goodwill and intangible assets. + References No definition available. + Details
Name: | lyts_LongLivedAssetsExcludingGoodwillAndIntangibleAssets
Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |