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Note 5 - Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] |
|  | Biological Indicators |  |  | Instruments |  |  | Continuous Monitoring |  |  | Total |
April 1, 2013 |  | $ | 9,279 |  |  | $ | 14,361 |  |  | $ | -- |  |  | $ | 23,640 |
Acquisitions |  |  | -- |  |  |  | 579 |  |  |  | 13,647 |  |  |  | 14,226 |
March 31, 2014 |  |  | 9,279 |  |  |  | 14,940 |  |  |  | 13,647 |  |  |  | 37,866 |
Acquisitions |  |  | 3,708 |  |  |  | 3,295 |  |  |  | -- |  |  |  | 7,003 |
March 31, 2015 |  | $ | 12,987 |  |  | $ | 18,235 |  |  | $ | 13,647 |  |  | $ | 44,869 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
(In thousands) |  | March 31, 201 5 |
|  | Carrying Amount |  |  | Accumulated Amortization |  |  | Net |  |  | Useful Life (Years) |
Intellectual property |  | $ | 7,210 |  |  | $ | 2,362 |  |  | $ | 4,848 |  |  |  | 10-16 |
Trade names |  |  | 3,158 |  |  |  | 863 |  |  |  | 2,295 |  |  |  | 3-10 |
Customer relationships |  |  | 36,408 |  |  |  | 10,752 |  |  |  | 25,656 |  |  |  | 7-10 |
Non-compete agreements |  |  | 1,286 |  |  |  | 854 |  |  |  | 432 |  |  |  | 3-10 |
|  | $ | 48,062 |  |  | $ | 14,831 |  |  | $ | 33,231 |  |  |  |  |
|  | March 31, 201 4 |
|  | Carrying Amount |  |  | Accumulated Amortization |  |  | Net |  |  | Useful Life (Years) |
Intellectual property |  | $ | 7,027 |  |  | $ | 1,641 |  |  | $ | 5,386 |  |  |  | 10-16 |
Trade names |  |  | 2,648 |  |  |  | 519 |  |  |  | 2,129 |  |  |  | 3-10 |
Customer relationships |  |  | 24,612 |  |  |  | 7,326 |  |  |  | 17,286 |  |  |  | 7-10 |
Non-compete agreements |  |  | 1,286 |  |  |  | 670 |  |  |  | 616 |  |  |  | 3-10 |
|  | $ | 35,573 |  |  | $ | 10,156 |  |  | $ | 25,417 |  |  |  |  |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
(In thousands) |  |  |  |
2016 |  | $ | 4,913 |
2017 |  |  | 4,773 |
2018 |  |  | 4,599 |
2019 |  |  | 4,271 |
2020 |  |  | 3,957 |

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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