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Note 16 - Summary of Quarterly Results (Unaudited) (Detail)	Aug. 17, 2012
Number of Shareholders	500
Number of Beneficial Shareholders	3,000

X

- Definition

Number of beneficial shareholders.

+ References

No definition available.

+ Details

Name:	lyts_NumberOfBeneficialShareholders
Namespace Prefix:	lyts_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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