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Note 8 - Segment Information (Details) - Revenues from External Customers (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Net revenues from unaffiliated customers: |  |  |  |
Revenues from unaffiliated customers | $ 18,540 | $ 12,676 | $ 34,940 | $ 23,894
UNITED STATES |  |  |  |
Net revenues from unaffiliated customers: |  |  |  |
Revenues from unaffiliated customers | 9,698 | 7,794 | 18,189 | 13,824
Foreign [Member] |  |  |  |
Net revenues from unaffiliated customers: |  |  |  |
Revenues from unaffiliated customers | $ 8,842 | $ 4,882 | $ 16,751 | $ 10,070

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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 + Details
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