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Note 9 - Cash Dividends (Details Textual) - USD ($) | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Payments of Dividends, Total |  | $ 2,600,000 | $ 2,600,000
Dividends Accrued |  | $ 104,346 | $ 52,383
Subsequent Event [Member] |  |  |
Quarterly Indicated Per Share Dividend Rate (in dollars per share) | $ 0.05 |  |
Dividends Payable, Date to be Paid | Feb. 09, 2021 |  |
Dividends Payable, Date of Record | Feb. 01, 2021 |  |
Annual Indicated per Share Dividend Rate (in dollars per share) | $ 0.20 |  |

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=121583591&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_
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Period Type: | duration

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=121586364&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: |