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Note 2- Summary of Significant Accounting Policies (Details) (USD $)
3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Note 2- Summary of Significant Accounting Policies (Details) [Line Items]          
Cash, FDIC Insured Amount $ 250,000us-gaap_CashFDICInsuredAmount   $ 250,000us-gaap_CashFDICInsuredAmount    
Cash, Uninsured Amount 20,926,000us-gaap_CashUninsuredAmount   20,926,000us-gaap_CashUninsuredAmount   12,367,000us-gaap_CashUninsuredAmount
Depreciation 1,425,000us-gaap_Depreciation 1,353,000us-gaap_Depreciation 2,863,000us-gaap_Depreciation 2,563,000us-gaap_Depreciation  
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset 0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset   0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability   0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability    
Research and Development Expense 1,450,000us-gaap_ResearchAndDevelopmentExpense 2,127,000us-gaap_ResearchAndDevelopmentExpense 3,301,000us-gaap_ResearchAndDevelopmentExpense 4,081,000us-gaap_ResearchAndDevelopmentExpense  
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares (in Shares) 383,000us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares 561,000us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares 383,000us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares 468,000us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares  
Leasehold Improvements [Member] | Maximum [Member]          
Note 2- Summary of Significant Accounting Policies (Details) [Line Items]          
Property, Plant and Equipment, Useful Life     15 years    
Product Warranty Exceptions [Member] | Maximum [Member]          
Note 2- Summary of Significant Accounting Policies (Details) [Line Items]          
Standard Warranty Term     10 years    
Foreign Bank Accounts [Member]          
Note 2- Summary of Significant Accounting Policies (Details) [Line Items]          
Cash, Uninsured Amount         $ 741,000us-gaap_CashUninsuredAmount
/ us-gaap_CashAndCashEquivalentsAxis
= lyts_ForeignBankAccountsMember
Maximum [Member]          
Note 2- Summary of Significant Accounting Policies (Details) [Line Items]          
Finite-Lived Intangible Asset, Useful Life     20 years    
Standard Warranty Term     5 years    
Minimum [Member]          
Note 2- Summary of Significant Accounting Policies (Details) [Line Items]          
Finite-Lived Intangible Asset, Useful Life     5 years    
Standard Warranty Term     1 year