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Note 14 - Severance Costs - Accrued Severance Liability Activity (Details) - USD ($) | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Balance | $ 1,772,000 | $ 235,000
Accrual of expense | 560,000 | 1,900,000
Payments | (1,198,000) | (363,000)
Adjustments |  |
Balance | $ 1,134,000 | $ 1,772,000

X
- Definition Represents information about the adjustments made to severance liability. + References No definition available. + Details
Name: | lyts_AdjustmentsToSeveranceLiability
Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents information about cash payments related to severance liability. + References No definition available. + Details
Name: | lyts_PaymentsForSeveranceLiability
Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References No definition available. + Details
Name: | lyts_SeveranceExpense
Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Liability for amount due employees, in addition to wages and any other money that employers owe employees, when their employment ends through a layoff or other termination. For example, a company may provide involuntarily terminated employees with a lump sum payment equal to one week's salary for every year of employment. + References No definition available. + Details
Name: | us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant