Note 6 - Leases (Details Textual) $ in Thousands	Mar. 31, 2020 USD ($) ft² a
Finance Lease, Right-of-Use Asset \| $	$ 0
Lessee, Operating Lease, Discount Rate	5.25%
Leased Automobiles [Member]
Lessee, Operating Lease, Term of Contract (Year)	3 years
GERMANY
Lessee, Operating Lease, Renewal Term (Year)	5 years
CANADA
Lessee, Operating Lease, Renewal Term (Year)	5 years
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility One [Member]
Area of Real Estate Property (Square Foot)	27,098
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility Two [Member]
Area of Real Estate Property (Square Foot)	27,289
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility Three [Member]
Area of Real Estate Property (Square Foot)	15,642
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility Four [Member] \| Massachusetts [Member]
Area of Real Estate Property (Square Foot)	12,878
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility Five [Member] \| Massachusetts [Member]
Area of Real Estate Property (Square Foot) \| a	26,447
United Kingdom Sales and Distribution Business [Member] \| Hereford, England [Member]
Area of Real Estate Property (Square Foot) \| a	2,258
International Operations Headquarter Facility [Member] \| GERMANY
Area of Real Estate Property (Square Foot)	16,470
Additional Area of Real Estate Property Added (Square Foot)	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
Period Type:	instant

- Definition

Amount, after accumulated amortization, of right-of-use asset from 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=121603541&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=121609121&loc=SL77918673-209980

+ Details

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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=121609121&loc=SL77918673-209980

+ Details

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Balance Type:	na
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:
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- Details

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