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Note 2 - Business Segment Information - Long-lived Assets by Geographical Region (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
--- | --- | --- | ---
Long-Lived Assets | [1] | $ 52,844 | $ 51,723 | $ 46,430
UNITED STATES |  |  |  |
Long-Lived Assets | [1] | 52,844 | 51,723 | 46,430
CANADA |  |  |  |
Long-Lived Assets | [1] |  |  |
[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

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

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