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Note 9 - Cash Dividends (Details) (USD $)
 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 30, 2015
Note 9 - Cash Dividends (Details) [Line Items]      
Payments of Ordinary Dividends, Common Stock $ 2,172,000us-gaap_PaymentsOfDividendsCommonStock $ 4,333,000us-gaap_PaymentsOfDividendsCommonStock  
Subsequent Event [Member]      
Note 9 - Cash Dividends (Details) [Line Items]      
Quarterly Indicated Per Share Dividend Rate     $ 0.03lyts_QuarterlyIndicatedPerShareDividendRate
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Annual Indicated Per Share Dividend Rate     $ 0.12lyts_AnnualIndicatedPerShareDividendRate
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember