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Note 13 - Segment Information - Operating Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Total revenues | [1] | $ 31,860 |  | $ 25,536 |  | $ 61,801 |  | $ 51,824 |
Gross profit |  | 21,285 |  | 15,586 |  | 41,625 |  | 31,790 |
Reconciling items | [2] | (18,901) |  | (11,812) |  | (38,487) |  | (22,591) |
Earnings before income taxes |  | 2,384 |  | 3,774 |  | 3,138 |  | 9,199 |
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |
Total revenues |  | 0 |  | 896 | [1] |  |  | 2,213 | [1]
Gross profit |  | 83 |  | 85 |  | 64 |  | 412 |
Sterilization and Disinfection Control [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Total revenues | [1] | 11,552 |  | 12,094 |  | 24,619 |  | 24,204 |
Gross profit |  | 8,770 |  | 8,723 |  | 18,790 |  | 17,233 |
Instruments [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Total revenues | [1] | 7,558 |  | 8,960 |  | 15,238 |  | 18,504 |
Gross profit |  | 4,852 |  | 5,557 |  | 9,541 |  | 11,639 |
Biopharmaceutical Development [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Total revenues |  | 9,131 | [1] | 0 |  | 15,080 | [1] |  |
Gross profit |  | 6,212 |  |  |  | 10,678 |  |  |
Cold Chain Monitoring [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Total revenues | [1] | 3,619 |  | 3,586 |  | 6,864 |  | 6,903 |
Gross profit |  | $ 1,368 |  | $ 1,221 |  | $ 2,552 |  | $ 2,506 |
[1] | Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.
[2] | Reconciling items include selling, general and administrative, research and development, interest expense and amortization of debt discount, and other (income) expenses.

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