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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
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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 | $ 18,560 us-gaap_SalesRevenueNet | $ 17,830 us-gaap_SalesRevenueNet | $ 18,540 us-gaap_SalesRevenueNet | $ 16,400 us-gaap_SalesRevenueNet | $ 15,714 us-gaap_SalesRevenueNet | $ 13,116 us-gaap_SalesRevenueNet | $ 12,676 us-gaap_SalesRevenueNet | $ 11,218 us-gaap_SalesRevenueNet | $ 12,808 us-gaap_SalesRevenueNet | $ 11,361 us-gaap_SalesRevenueNet | $ 11,706 us-gaap_SalesRevenueNet | $ 10,560 us-gaap_SalesRevenueNet | $ 71,330 us-gaap_SalesRevenueNet | $ 52,724 us-gaap_SalesRevenueNet | $ 46,435 us-gaap_SalesRevenueNet
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  | 45,798 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 29,551 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 28,590 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Foreign [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,532 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mlab_ForeignMember | $ 23,173 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mlab_ForeignMember | $ 17,845 us-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 + Details
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