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Note 15 - Segment Data - Revenues From External Customers (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Revenues	$ 24,299	$ 23,843	$ 24,409	$ 21,114	$ 24,812	$ 19,913	$ 21,776	$ 18,158	$ 18,560	$ 17,830	$ 18,540	$ 16,400	$ 93,665	$ 84,659	$ 71,330
UNITED STATES
Revenues													52,989	53,094	45,798
Foreign [Member]
Revenues													$ 40,676	$ 31,565	$ 25,532

X

- 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=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=mlab_ForeignMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: