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Note 12 - Segment Information - Operating Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Revenue from Contract with Customer, Excluding Assessed Tax, Total | [1] | $ 31,655 | $ 26,682 | $ 83,479 | $ 76,689
Gross profit (loss) |  | 14,677 | 15,634 | 46,292 | 45,302
Reconciling items (2) | [2] | (19,880) | (14,686) | (42,471) | (38,648)
Earnings (loss) before income taxes |  | (5,203) | 948 | 3,821 | 6,654
Sterilzation and Disinfection Control [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | [1] | 11,619 | 11,545 | 35,823 | 34,475
Gross profit (loss) |  | 8,098 | 7,876 | 25,323 | 23,660
Reconciling items (2) | [2] |  |  |  |
Earnings (loss) before income taxes |  |  |  |  |
Instruments [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | [1] | 10,014 | 9,341 | 28,518 | 26,776
Gross profit (loss) |  | 6,520 | 5,922 | 18,128 | 16,909
Reconciling items (2) | [2] |  |  |  |
Earnings (loss) before income taxes |  |  |  |  |
Biopharmaceutical Development [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | [1] | 5,637 |  | 5,637 |
Gross profit (loss) |  | (1,294) |  | (1,294) |
Reconciling items (2) | [2] |  |  |  |
Earnings (loss) before income taxes |  |  |  |  |
Cold Chain Monitoring [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | [1] | 4,156 | 3,744 | 11,059 | 9,917
Gross profit (loss) |  | 1,371 | 1,575 | 3,741 | 4,203
Reconciling items (2) | [2] |  |  |  |
Earnings (loss) before income taxes |  |  |  |  |
Cold Chain Packaging [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | [1] | 229 | 2,052 | 2,442 | 5,521
Gross profit (loss) |  | (18) | 261 | 394 | 530
Reconciling items (2) | [2] |  |  |  |
Earnings (loss) 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, impairment of goodwill and long lived assets, and other expenses.

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