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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Revenue | [1] | $ 133,937 | $ 117,687 | $ 103,135
Consumables [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 63,009 | 53,311 | 49,589
Hardware and Software [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 44,019 | 40,090 | 32,209
Service [Member] |  |  |  |
Revenue |  | 26,909 | 24,286 | 21,337
Service [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 15,626 | 14,936 | 12,069
Service [Member] | Transferred over Time [Member] |  |  |  |
Revenue |  | 11,283 | 9,350 | 9,268
Operating Segments [Member] |  |  |  |
Revenue | [1] | 133,937 | 115,224 | 96,228
Corporate, Non-Segment [Member] |  |  |  |
Revenue | [2] | 0 | 2,463 | 6,907
Corporate, Non-Segment [Member] | Consumables [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 0 | 2,436 | 6,430
Corporate, Non-Segment [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 0 | 0 | 142
Corporate, Non-Segment [Member] | Service [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 0 | 27 | 335
Corporate, Non-Segment [Member] | Service [Member] | Transferred over Time [Member] |  |  |  |
Revenue |  | 0 | 0 | 0
Sterilization and Disinfection Control [Member] | Operating Segments [Member] |  |  |  |
Revenue | [1] | 53,119 | 49,660 | 46,297
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 45,869 | 42,654 | 39,670
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 505 | 551 | 580
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 1,848 | 1,592 | 1,209
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member] |  |  |  |
Revenue |  | 4,897 | 4,863 | 4,838
Instruments [Member] | Operating Segments [Member] |  |  |  |
Revenue | [1] | 32,465 | 37,984 | 36,125
Instruments [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 3,135 | 3,197 | 3,101
Instruments [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 21,346 | 25,627 | 24,500
Instruments [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 7,980 | 9,160 | 8,524
Instruments [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member] |  |  |  |
Revenue |  | 4 | 0 | 0
Biopharmaceutical Development [Member] | Operating Segments [Member] |  |  |  |
Revenue | [1] | 33,892 | 13,851 | 0
Biopharmaceutical Development [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 13,942 | 4,981 | 0
Biopharmaceutical Development [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 13,545 | 6,015 | 0
Biopharmaceutical Development [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 2,928 | 1,761 | 0
Biopharmaceutical Development [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member] |  |  |  |
Revenue |  | 3,477 | 1,094 | 0
Continuous Monitoring [Member] | Operating Segments [Member] |  |  |  |
Revenue |  | 14,461 | 13,729 | 13,806
Continuous Monitoring [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 63 | 43 | 388
Continuous Monitoring [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 8,623 | 7,897 | 6,987
Continuous Monitoring [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member] |  |  |  |
Revenue |  | 2,870 | 2,396 | 2,001
Continuous Monitoring [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member] |  |  |  |
Revenue |  | $ 2,905 | $ 3,393 | $ 4,430
[1] | Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.
[2] | Non-reportable operating segments (including our Cold Chain Packaging Division which ceased operations during the year ended March 31, 2020) and unallocated corporate expenses are reported within Corporate and Other.

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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