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Note 14 - Severance Costs (Details) - Accrued Severance Liability Activity - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2015
Accrued Severance Liability Activity [Abstract] |  |  |
Balance at beginning of the period | $ 379 |  |
Accrual of expense | 13 | $ 144 | $ 1,718
Payments | (200) | (24) | (704)
Adjustments | (58) |  | (635)
Balance at end of the period | $ 134 | $ 120 | $ 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
- References No definition available. + Details
Name: | lyts_AccruedSeveranceLiabilityActivityAbstract
Namespace Prefix: | lyts_
Data Type: | xbrli:stringItemType
Balance Type: | na
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