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Note 14 - Severance Costs (Tables) | 3 Months Ended
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Sep. 30, 2021
Employee Severance [Member] |
Notes Tables |
Schedule of Accrued Severance Liability [Table Text Block] |
|  | Three Months |  |  | Three Months |  |  | Fiscal Year |
|  | Ended |  |  | Ended |  |  | Ended |
|  | September 30, |  |  | September 30, |  |  | June 30, |
(In thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |
Balance at beginning of period |  | $ | 13 |  |  | $ | 639 |  |  | $ | 639 |
Accrual of expense |  |  | - |  |  |  | - |  |  |  | 41 |
Payments |  |  | (13 | ) |  |  | (225 | ) |  |  | (667 | )
Balance at end of period |  | $ | - |  |  | $ | 414 |  |  | $ | 13 |

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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: | dtr-types: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: |