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Note 2 - Acquisitions Dispositions (Details) - Purchase Price Allocation - PCD (USD $)	9 Months Ended
	Dec. 31, 2014	Mar. 31, 2014	Oct. 15, 2014
Note 2 - Acquisitions Dispositions (Details) - Purchase Price Allocation - PCD [Line Items]
Contingent consideration liability	$ 1,920,000us-gaap_BusinessCombinationContingentConsiderationLiability	$ 1,620,000us-gaap_BusinessCombinationContingentConsiderationLiability
Goodwill	44,097,000us-gaap_Goodwill	37,866,000us-gaap_Goodwill
PCD Acquisition [Member]
Note 2 - Acquisitions Dispositions (Details) - Purchase Price Allocation - PCD [Line Items]
Cash consideration	5,000,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Holdback payment liability	250,000mlab_BusinessCombinationHoldBackConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Contingent consideration liability	300,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember		300,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Aggregate consideration	5,550,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Inventories, net	137,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Property, plant and equipment, net	7,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Intangibles, net	3,678,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Goodwill	1,743,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Accrued expenses	(15,000)mlab_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpenses / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Total purchase price allocation	$ 5,550,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember

X

- Definition

Amount of hold back liability recognized arising from a business combination.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Amount of liabilities incurred that are used in an entity's business, assumed at the acquisition date.

+ References

No definition available.

+ Details

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X

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



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X

- 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

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-Paragraph 6

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



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-Paragraph 1

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X

- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

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X

- Definition

The amount of inventory recognized as of the acquisition date.

+ References

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-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

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

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X

- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

+ References

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-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

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X

- Definition

Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

+ References

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-Publisher FASB

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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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-Paragraph 13

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