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Note 10 - Cash Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Feb. 15, 2022
Payments of Dividends, Total |  | $ 2.7 | $ 2.6 |
Dividends Accrued |  | $ 0.1 | $ 0.1 |
Subsequent Event [Member] |  |  |  |
Quarterly Indicated Per Share Dividend Rate (in dollars per share) |  |  |  | $ 0.05
Dividends Payable, Date to be Paid | Feb. 15, 2022 |  |  |

X
- Definition Dividends declared but unpaid on equity securities issued by the entity during the period. + References No definition available. + Details
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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
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Namespace Prefix: | lyts_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Date the declared dividend will be paid, in YYYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + 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=123570139&loc=d3e3291-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |