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Note 9 - Segment Information (Details) - Operating Segment Asset Reconciliation (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2014
Total assets
Total assets	$ 116,178us-gaap_Assets	$ 97,529us-gaap_Assets
Biological Indicators [Member]
Total assets
Total assets	25,921us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember	22,771us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember
Instruments [Member]
Total assets
Total assets	54,308us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember	36,797us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember
Continuous Monitoring [Member]
Total assets
Total assets	31,086us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember	28,578us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember
Corporate Segment [Member]
Total assets
Total assets	$ 4,863us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ 9,383us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

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