XML 64 R49.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Note 2 - Business Segment Information (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Intersegment Revenue Markup Percentage |  | 10.00% |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage |  | 0.00% | 0.00% | 0.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage |  | 0.00% | 0.00% |
Reclassification of Operating Loss from the Technology Segment to the Graphics Segment [Member] | Fiscal 2016 [Member] |  |  |  |
Prior Period Reclassification Adjustment | $ 183,000 |  |  |
Reclassification of Operating Loss from the Technology Segment to the Graphics Segment [Member] | Fiscal 2015 [Member] |  |  |  |
Prior Period Reclassification Adjustment | $ 204,000 |  |  |

X
- Definition The percentage of mark-up to intersegment revenue. + References No definition available. + Details
Name: | lyts_IntersegmentRevenueMarkupPercentage
Namespace Prefix: | lyts_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
Name: | us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis=lyts_ReclassificationOfOperatingLossFromTheTechnologySegmentToTheGraphicsSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreationDateAxis=lyts_Fiscal2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreationDateAxis=lyts_Fiscal2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |