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Note 9 - Segment Information (Details) - Revenues from External Customers (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Net revenues from unaffiliated customers:
Revenues from unaffiliated customers	$ 17,830us-gaap_SalesRevenueNet	$ 13,116us-gaap_SalesRevenueNet	$ 52,770us-gaap_SalesRevenueNet	$ 37,010us-gaap_SalesRevenueNet
UNITED STATES
Net revenues from unaffiliated customers:
Revenues from unaffiliated customers	11,423us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	7,054us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	29,612us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	20,877us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Foreign [Member]
Net revenues from unaffiliated customers:
Revenues from unaffiliated customers	$ 6,407us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mlab_ForeignMember	$ 6,062us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mlab_ForeignMember	$ 23,158us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mlab_ForeignMember	$ 16,133us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mlab_ForeignMember

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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