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Note 14 - Segment Information (Details) - Revenues from External Customers (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Revenues from unaffiliated customers
Revenues from unaffiliated customers	$ 18,560us-gaap_SalesRevenueNet	$ 17,830us-gaap_SalesRevenueNet	$ 18,540us-gaap_SalesRevenueNet	$ 16,400us-gaap_SalesRevenueNet	$ 15,714us-gaap_SalesRevenueNet	$ 13,116us-gaap_SalesRevenueNet	$ 12,676us-gaap_SalesRevenueNet	$ 11,218us-gaap_SalesRevenueNet	$ 12,808us-gaap_SalesRevenueNet	$ 11,361us-gaap_SalesRevenueNet	$ 11,706us-gaap_SalesRevenueNet	$ 10,560us-gaap_SalesRevenueNet	$ 71,330us-gaap_SalesRevenueNet	$ 52,724us-gaap_SalesRevenueNet	$ 46,435us-gaap_SalesRevenueNet
UNITED STATES
Revenues from unaffiliated customers
Revenues from unaffiliated customers													45,798us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	29,551us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	28,590us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Foreign [Member]
Revenues from unaffiliated customers
Revenues from unaffiliated customers													$ 25,532us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mlab_ForeignMember	$ 23,173us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mlab_ForeignMember	$ 17,845us-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

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