Note 6 - Leases (Details Textual) $ in Thousands	Sep. 30, 2019 USD ($) ft²
Finance Lease, Right-of-Use Asset \| $	$ 0
Lessee, Operating Lease, Discount Rate	5.25%
Leased Automobiles [Member]
Lessee, Operating Lease, Term of Contract	3 years
GERMANY
Lessee, Operating Lease, Renewal Term	5 years
CANADA
Lessee, Operating Lease, Renewal Term	5 years
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility One [Member]
Area of Real Estate Property	27,098
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility Two [Member]
Area of Real Estate Property	27,289
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility Three [Member]
Area of Real Estate Property	15,642
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility Four [Member] \| Massachusetts [Member]
Area of Real Estate Property	12,878
International Operations Headquarter Facility [Member] \| GERMANY
Area of Real Estate Property	16,470
Additional Area of Real Estate Property Added	3,630

Information related to the additional area of real estate added.

No definition available.

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Namespace Prefix:	lmat_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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- Definition

Amount of lessee's right to use underlying asset under finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

- Definition

Discount rate used by lessee to determine present value of operating lease payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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Period Type:	instant

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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- Details

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- Details

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- Details

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- Details

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