Business Acquisition Contingent Consideration At Fair Value Including Accrued Interest

No definition available.

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- Definition

Liability Payment Period

+ References

No definition available.

+ Details

Name:	lyts_LiabilityPaymentPeriod
Namespace Prefix:	lyts_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	lyts_Note13CommitmentsAndContingenciesDetailsLineItems
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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 35

-Paragraph 1

-Subparagraph b

-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 25

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The estimated maximum amount of possible loss from the contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

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Balance Type:	debit
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Note 13 - Commitments And Contingencies (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Mar. 19, 2012
Note 13 - Commitments And Contingencies (Details) [Line Items]
Loss Contingency, Range of Possible Loss, Maximum	$ 4,000,000
Reversed [Member] \| LSI Virticus [Member]
Note 13 - Commitments And Contingencies (Details) [Line Items]
BusinessAcquisitionContingentConsiderationAtFairValueIncludingAccruedInterest	20,000
LSI Virticus [Member]
Note 13 - Commitments And Contingencies (Details) [Line Items]
Business Combination, Contingent Consideration, Liability	0	218,000	877,000
Liability Payment Period			5
Standby Letters of Credit [Member]
Note 13 - Commitments And Contingencies (Details) [Line Items]
Letters of Credit Outstanding, Amount	$ 300,000