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Note 18 - Summary of Quarterly Results (Unaudited) (Details Textual) - Subsequent Event [Member] | Aug. 30, 2018
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Number of Shareholders | 654
Number of Beneficial Shareholders | 3,000

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- Definition Number of beneficial shareholders. + References No definition available. + Details
Name: | lyts_NumberOfBeneficialShareholders
Namespace Prefix: | lyts_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shareholders of record. + References No definition available. + Details
Name: | lyts_NumberOfShareholders
Namespace Prefix: | lyts_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |