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Note 12 - Commitments and Contingencies (Details) (USD $)
1 Months Ended
Mar. 19, 2012
Mar. 31, 2015
Jun. 30, 2013
LSI Virticus [Member]      
Note 12 - Commitments and Contingencies (Details) [Line Items]      
Business Combination, Contingent Consideration, Liability $ 877,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= lyts_LSIVirticusMember
  $ 0us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= lyts_LSIVirticusMember
Liability Payment Period 5 years    
Loss Contingency, Range of Possible Loss, Maximum   3,000,000us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_BusinessAcquisitionAxis
= lyts_LSIVirticusMember
 
Standby Letters of Credit [Member]      
Note 12 - Commitments and Contingencies (Details) [Line Items]      
Letters of Credit Outstanding, Amount   $ 0us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember