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Note 7 - Goodwill and Other Intangible Assets (Details) - Amortization Expense of Other Intangible Assets (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Three Months Ended [Member]    
Note 7 - Goodwill and Other Intangible Assets (Details) - Amortization Expense of Other Intangible Assets [Line Items]    
Amortization of Intangible Assets $ 127us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementScenarioAxis
= lyts_ThreeMonthsEndedMember
$ 208us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementScenarioAxis
= lyts_ThreeMonthsEndedMember
Six Months Ended [Member]    
Note 7 - Goodwill and Other Intangible Assets (Details) - Amortization Expense of Other Intangible Assets [Line Items]    
Amortization of Intangible Assets $ 275us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementScenarioAxis
= lyts_SixMonthsEndedMember
$ 406us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementScenarioAxis
= lyts_SixMonthsEndedMember