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Note 12 - Segment Data - Operating Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | $ 57,833 |  | $ 53,165 | $ 116,003 |  | $ 103,810
Gross profit |  | 35,455 |  | 32,109 | 72,704 |  | 63,292
Operating expense |  | 31,947 |  | 32,169 | 63,616 |  | 64,016
Operating income (loss) |  | 3,508 |  | (60) | 9,088 |  | (724)
Nonoperating expense, net |  | 304 |  | (1,265) | (1,371) |  | (1,538)
Operating Segments [Member] |  |  |  |  |  |  |
Gross profit |  | 35,455 |  | 32,119 | 72,704 |  | 63,302
Operating expense |  | 31,947 |  | 32,169 | 63,616 |  | 64,016
Operating income (loss) |  | 3,508 |  | (60) | 9,088 |  | (724)
Nonoperating expense, net |  | (304) |  | 1,265 | 1,371 |  | 1,538
Earnings (loss) before income taxes |  | 3,812 |  | (1,325) | 7,717 |  | (2,262)
Operating Segments [Member] | Sterilization and Disinfection Control [Member] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1],[2] | 22,205 | [3] | 17,080 | 45,162 | [4] | 33,007
Gross profit | [2] | 15,172 |  | 12,476 | 30,730 |  | 24,067
Operating Segments [Member] | Clinical Genomics [Member] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | 11,499 |  | 15,549 | 22,903 |  | 28,918
Gross profit |  | 5,906 |  | 7,727 | 12,396 |  | 14,455
Operating Segments [Member] | Biopharmaceutical Development [Member] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | 11,867 |  | 9,207 | 23,875 |  | 19,096
Gross profit |  | 7,167 |  | 5,509 | 15,126 |  | 11,942
Operating Segments [Member] | Calibration Solutions [Member] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | 12,262 |  | 11,329 | 24,063 |  | 22,789
Gross profit |  | 7,210 |  | 6,407 | 14,452 |  | 12,838
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |  |  |  |
Gross profit | [5] | $ 0 |  | $ (10) | $ 0 |  | $ (10)
[1] | Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.
[2] | Includes post-acquisition GKE results during the three and six months ended September 30, 2024.
[3] | Revenues of $5,863 from GKE are included in the Sterilization and Disinfection Control division during the three months ended September 30, 2024.
[4] | Revenues of $12,117 from GKE are included in the Sterilization and Disinfection Control division during the six months ended September 30, 2024.
[5] | Unallocated corporate expenses are reported within corporate and other.

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