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Note 14 - Segment Information (Tables) | 12 Months Ended
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Mar. 31, 2015
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Year Ended March 31, 2015 |
|  | Biological Indicators |  |  | Instruments |  |  | Continuous Monitoring |  |  | Total |
Revenues |  | $ | 27,390 |  |  | $ | 33,054 |  |  | $ | 10,886 |  |  | $ | 71,330 |
Gross profit |  | $ | 17,142 |  |  | $ | 20,763 |  |  | $ | 5,487 |  |  | $ | 43,392 |
Selling expenses |  |  | 1,551 |  |  |  | 3,441 |  |  |  | 2,184 |  |  |  | 7,176 |
|  | $ | 15,591 |  |  | $ | 17,322 |  |  | $ | 3,303 |  |  |  | 36,216 |
Reconciling items (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20,869 | )
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 15,347 |
|  | Year Ended March 31, 2014 |
|  | Biological Indicators |  |  | Instruments |  |  | Continuous Monitoring |  |  | Total |
Revenues |  | $ | 22,992 |  |  | $ | 26,389 |  |  | $ | 3,343 |  |  | $ | 52,724 |
Gross profit |  | $ | 13,187 |  |  | $ | 16,904 |  |  | $ | 1,597 |  |  | $ | 31,688 |
Selling expenses |  |  | 1,350 |  |  |  | 3,954 |  |  |  | 815 |  |  |  | 6,119 |
|  | $ | 11,837 |  |  | $ | 12,950 |  |  | $ | 782 |  |  |  | 25,569 |
Reconciling items (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,466 | )
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 13,103 |
|  | Year Ended March 31, 2013 |
|  | Biological Indicators |  |  | Instruments |  |  | Continuous Monitoring |  |  | Total |
Revenues |  | $ | 21,464 |  |  | $ | 24,971 |  |  | $ | -- |  |  | $ | 46,435 |
Gross profit |  | $ | 12,365 |  |  | $ | 16,497 |  |  | $ | -- |  |  | $ | 28,862 |
Selling expenses |  |  | 1,552 |  |  |  | 3,078 |  |  |  | -- |  |  |  | 4,630 |
|  | $ | 10,813 |  |  | $ | 13,419 |  |  | $ | -- |  |  |  | 24,232 |
Reconciling items (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,254 | )
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 12,978 |
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] |
|  | Year Ended March 31, |
|  | 201 5 |  |  | 201 4 |  |  | 201 3 |
Revenues from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 45,798 |  |  | $ | 29,551 |  |  | $ | 28,590 |
Foreign |  |  | 25,532 |  |  |  | 23,173 |  |  |  | 17,845 |
|  | $ | 71,330 |  |  | $ | 52,724 |  |  | $ | 46,435 |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | March 31, |
|  | 2015 |  |  | 2014 |
Total assets |  |  |  |  |  |  |  |
Biological Indicators |  | $ | 36,304 |  |  | $ | 22,771 |
Instruments |  |  | 44,401 |  |  |  | 36,797 |
Continuous Monitoring |  |  | 31,558 |  |  |  | 28,578 |
Corporate and administrative |  |  | 5,057 |  |  |  | 9,383 |
|  | $ | 117,320 |  |  | $ | 97,529 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8721-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8813-108599 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8736-108599 + Details
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