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Note 14 - Severance Costs (Details) (USD $)
1 Months Ended 3 Months Ended
Jan. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Subsequent Event [Member]      
Note 14 - Severance Costs (Details) [Line Items]      
Percent of Reduction of Workforce 8.30%lyts_PercentOfReductionOfWorkforce
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Employee Related, Reduction In Annual Compensation And Benefits $ (3,700,000)lyts_EmployeeRelatedReductionInAnnualCompensationAndBenefits
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Scenario, Forecast [Member] | Facility Closing [Member]      
Note 14 - Severance Costs (Details) [Line Items]      
Business Exit Costs   33,000us-gaap_BusinessExitCosts1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
 
Scenario, Forecast [Member]      
Note 14 - Severance Costs (Details) [Line Items]      
Severance Costs   543,000us-gaap_SeveranceCosts1
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
 
Chief Executive Officer [Member]      
Note 14 - Severance Costs (Details) [Line Items]      
Severance Costs     800,000us-gaap_SeveranceCosts1
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
Payments for Postemployment Benefits     154,000us-gaap_PaymentsForPostemploymentBenefits
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
Supplemental Unemployment Benefits, Severance Benefits     $ 646,000us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember