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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenues | [1] | $ 25,536 | $ 24,865 | $ 51,824 | $ 50,007
Consumables [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 11,572 | 11,394 | 24,329 | 23,560
Hardware and Software [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 7,892 | 7,569 | 16,547 | 14,653
Service [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 3,704 | 3,476 | 6,598 | 6,869
Service [Member] | Transferred over Time [Member] |  |  |  |  |
Revenues |  | 2,368 | 2,426 | 4,350 | 4,925
Sterilzation and Disinfection Control [Member] |  |  |  |  |
Revenues | [1] | 12,094 | 11,582 | 24,204 | 22,930
Sterilzation and Disinfection Control [Member] | Consumables [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 10,122 | 9,093 | 20,539 | 18,663
Sterilzation and Disinfection Control [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 148 | 704 | 334 | 908
Sterilzation and Disinfection Control [Member] | Service [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 641 | 291 | 941 | 642
Sterilzation and Disinfection Control [Member] | Service [Member] | Transferred over Time [Member] |  |  |  |  |
Revenues |  | 1,183 | 1,494 | 2,390 | 2,717
Instruments [Member] |  |  |  |  |
Revenues | [1] | 8,960 | 8,704 | 18,504 | 17,435
Instruments [Member] | Consumables [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 563 | 641 | 1,583 | 1,433
Instruments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 5,923 | 5,672 | 12,401 | 11,212
Instruments [Member] | Service [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 2,474 | 2,391 | 4,520 | 4,790
Instruments [Member] | Service [Member] | Transferred over Time [Member] |  |  |  |  |
Revenues |  |  |  |  |
Cold Chain Monitoring [Member] |  |  |  |  |
Revenues | [1] | 3,586 | 2,950 | 6,903 | 6,173
Cold Chain Monitoring [Member] | Consumables [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 10 | 127 | 21 | 191
Cold Chain Monitoring [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 1,821 | 1,193 | 3,812 | 2,533
Cold Chain Monitoring [Member] | Service [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 570 | 698 | 1,110 | 1,241
Cold Chain Monitoring [Member] | Service [Member] | Transferred over Time [Member] |  |  |  |  |
Revenues |  | 1,185 | 932 | 1,960 | 2,208
Cold Chain Packaging [Member] |  |  |  |  |
Revenues | [1] | 896 | 1,629 | 2,213 | 3,469
Cold Chain Packaging [Member] | Consumables [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 877 | 1,533 | 2,186 | 3,273
Cold Chain Packaging [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  |  |  |  |
Cold Chain Packaging [Member] | Service [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Revenues |  | 19 | 96 | 27 | 196
Cold Chain Packaging [Member] | Service [Member] | Transferred over Time [Member] |  |  |  |  |
Revenues |  |  |  |  |
[1] | Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.

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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 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: 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=118956577&loc=SL49130545-203045 + Details
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