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Note 13 - Severance Costs (Tables) | 3 Months Ended
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Sep. 30, 2017
Employee Severance [Member] |
Notes Tables |
Schedule of Accrued Severance Liability [Table Text Block] |
|  | Three |  |  | Three |  |  | Fiscal |
|  | Months Ended |  |  | Months Ended |  |  | Year Ended |
(In thousands) |  | September 30, |  |  | September 30, |  |  | June 30, |
|  | 201 7 |  |  | 201 6 |  |  | 201 7 |
Balance at beginning of the period |  | $ | 235 |  |  | $ | 39 |  |  | $ | 39 |
Accrual of expense |  |  | -- |  |  |  | 145 |  |  |  | 523 |
Payments |  |  | (159 | ) |  |  | (119 | ) |  |  | (313 | )
Adjustments |  |  | -- |  |  |  | -- |  |  |  | (14 | )
Balance at end of the period |  | $ | 76 |  |  | $ | 65 |  |  | $ | 235 |

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- Definition The tabular disclosure of the accrued severance liabilities. + References No definition available. + Details
Name: | lyts_ScheduleOfAccruedSeveranceLiabilityTableTextBlock
Namespace Prefix: | lyts_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |