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Note 11 - Segment Information - Operating Segment Information (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
Gross profit |  | 15,476 | 14,577 | 31,615 | 29,668
Reconciling items | [2] | (11,812) | (13,271) | (22,591) | (23,962)
Earnings before income taxes |  | 3,664 | 1,306 | 9,024 | 5,706
Sterilzation and Disinfection Control [Member] |  |  |  |  |
Revenues | [1] | 12,094 | 11,582 | 24,204 | 22,930
Gross profit |  | 8,720 | 7,972 | 17,225 | 15,784
Reconciling items | [2] |  |  |  |
Earnings before income taxes |  |  |  |  |
Instruments [Member] |  |  |  |  |
Revenues | [1] | 8,960 | 8,704 | 18,504 | 17,435
Gross profit |  | 5,545 | 5,354 | 11,608 | 10,987
Reconciling items | [2] |  |  |  |
Earnings before income taxes |  |  |  |  |
Cold Chain Monitoring [Member] |  |  |  |  |
Revenues | [1] | 3,586 | 2,950 | 6,903 | 6,173
Gross profit |  | 1,126 | 1,164 | 2,370 | 2,628
Reconciling items | [2] |  |  |  |
Earnings before income taxes |  |  |  |  |
Cold Chain Packaging [Member] |  |  |  |  |
Revenues | [1] | 896 | 1,629 | 2,213 | 3,469
Gross profit |  | $ 85 | 87 | 412 | 269
Reconciling items | [2] |  |  |  |
Earnings before income taxes |  |  |  |  |
[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, legal settlement, and other expenses.

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