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Significant Suppliers and Customers (Details Narrative)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Significant Suppliers And Customers Details Narrative
Significant Customer Risk Description	sales to four customers individually comprised at least 5% of our annual sales	sales to three customers individually comprised at least 5% of our annual sales
Crimson Trace	10.00%	7.00%
AMS Technologies AG	9.00%
Thorlabs	9.00%	9.00%
Edmunds Industrial Optics		6.00%
Raytheon Missile Systems	5.00%

X

- Definition

The percentage of annual sales attributable to AMS Technologies AG.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of annual sales attributable to Crimson Trace.

+ References

No definition available.

+ Details

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Namespace Prefix:	LPTH_
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X

- Definition

The percentage of annual sales attributable to Edmunds Industrial Optics.

+ References

No definition available.

+ Details

Name:	LPTH_ConcentrationRiskPercentageEdmundsIndustrial
Namespace Prefix:	LPTH_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of annual sales attributable to Raytheon Missile Systems.

+ References

No definition available.

+ Details

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Namespace Prefix:	LPTH_
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X

- Definition

The percentage of annual sales attributable to Thorlabs.

+ References

No definition available.

+ Details

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Namespace Prefix:	LPTH_
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X

- Details

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X

- Definition

Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

+ References

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 94-6

-Paragraph 22, 24

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Section 50

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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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