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Note 8 - Segment Information (Details) - Operating Segment Asset Reconciliation (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Mar. 31, 2014
--- | --- | ---
Total assets |  |
Total assets | $ 112,100 | $ 97,529
Biological Indicators [Member] |  |
Total assets |  |
Total assets | 26,582 | 22,771
Instruments [Member] |  |
Total assets |  |
Total assets | 46,023 | 36,797
Continuous Monitoring [Member] |  |
Total assets |  |
Total assets | 31,182 | 28,578
Corporate Segment [Member] |  |
Total assets |  |
Total assets | $ 8,313 | $ 9,383

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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