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Note 14 - Accrued Severance Liability Activity (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Jun. 30, 2015
Balance at | $ 379 |  |
Accrual of expense | 401 | $ 1,297 | $ 1,718
Payments | (544) | (530) | (704)
Adjustments | (67) | (635) | (635)
Balance at | $ 169 | $ 132 | $ 379

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

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 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Postemployment Benefits -URI http://asc.fasb.org/extlink&oid=6519534 + Details
Name: | us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant