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Note 8 - Cash Dividends (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Aug. 31, 2018
Payments of Ordinary Dividends, Common Stock | $ 5,154,000 | $ 5,048,000 | $ 4,214,000 |
Dividends Accrued | $ 50,621 | $ 30,067 |  |
Quarterly Indicated Per Share Dividend Rate |  |  |  | $ 0.05

X
- Definition Dividends declared but unpaid on equity securities issued by the entity during the period. + References No definition available. + Details
Name: | lyts_DividendsAccrued
Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The indicated per share quarterly cash dividend rate. + References No definition available. + Details
Name: | lyts_QuarterlyIndicatedPerShareDividendRate
Namespace Prefix: | lyts_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfDividendsCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration