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Note 9 - Cash Dividends (Details Textual) - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Feb. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2020
Payments of Dividends, Total |  | $ 2,643,000 | $ 2,587,000 |
Dividends Accrued |  | $ 52,383 | $ 34,631 |
Forecast [Member] |  |  |  |
Annual Indicated per Share Dividend Rate |  |  |  | $ 0.20
Subsequent Event [Member] |  |  |  |
Quarterly Indicated Per Share Dividend Rate | $ 0.05 |  |  |
Dividends Payable, Date to be Paid | Feb. 26, 2020 |  |  |
Dividends Payable, Date of Record | Feb. 18, 2020 |  |  |

X
- Definition The indicated per share dividend rate for a specific fiscal year. + References No definition available. + Details
Name: | lyts_AnnualIndicatedPerShareDividendRate
Namespace Prefix: | lyts_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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

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

X
- Definition Date the declared dividend will be paid, in CCYY-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=98513485&loc=d3e4304-108586 + Details
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X
- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
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X
- 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=118932676&loc=d3e3291-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Details
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Balance Type: |
Period Type: |