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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
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Total assets |  |
Total assets | $ 116,178 us-gaap_Assets | $ 97,529 us-gaap_Assets
Biological Indicators [Member] |  |
Total assets |  |
Total assets | 25,921 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember | 22,771 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember
Instruments [Member] |  |
Total assets |  |
Total assets | 54,308 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember | 36,797 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember
Continuous Monitoring [Member] |  |
Total assets |  |
Total assets | 31,086 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember | 28,578 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember
Corporate Segment [Member] |  |
Total assets |  |
Total assets | $ 4,863 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | $ 9,383 us-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 + Details
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