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Note 14 - Restructuring Costs - Summary of Restructuring Costs for the Period (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Restructuring and related costs		$ 697		$ 1,353
Severance and Other Termination Benefits [Member]
Restructuring and related costs		526		691
Lease Obligation Restructuring [Member]
Restructuring and related costs				213
Restructuring Impairment of Fixed Assets and Accelerated Depreciation [Member]
Restructuring and related costs		80		353
Other Restructuring [Member]
Restructuring and related costs		$ 91		$ 96

X

- Definition

Discloses the amount of restructuring cost or gain incurred during the period.

+ References

No definition available.

+ Details

Name:	lyts_RestructuringAndRelatedCostIncurredCostGain
Namespace Prefix:	lyts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=lyts_SeveranceAndOtherTerminationBenefitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=lyts_LeaseObligationRestructuringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=lyts_RestructuringImpairmentOfFixedAssetsAndAcceleratedDepreciationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_OtherRestructuringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: