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Note 11 - Segment Data - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Revenues (a): |  | $ 60,737 | $ 57,833 | $ 120,280 | $ 116,003
Total segment cost of revenues |  | 23,406 | 22,378 | 46,010 | 43,299
Gross Profit (c) |  | 37,331 | 35,455 | 74,270 | 72,704
Operating expense |  | 32,607 | 31,947 | 66,482 | 63,616
Operating income |  | 4,724 | 3,508 | 7,788 | 9,088
Nonoperating expense, net |  | (2,725) | 304 | 1,223 | (1,371)
Non-cash GKE inventory step-up amortization |  |  |  | 0 | 1,232
Nonoperating (income), net |  | 2,725 | (304) | (1,223) | 1,371
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |  |
Revenues (a): | [1] | 60,737 | 57,833 | 120,280 | 116,003
Depreciation in cost of revenues |  | 791 | 904 | 1,601 | 1,766
Amortization in cost of revenues |  | 707 | 672 | 1,409 | 1,319
Other cost of revenues (b) | [2] | 21,908 | 20,348 | 43,000 | 38,982
Total segment cost of revenues |  | 23,406 | 22,378 | 46,010 | 43,299
Gross Profit (c) | [3] | 37,331 | 35,455 | 74,270 | 72,704
Operating expense |  | 32,607 | 31,947 | 66,482 | 63,616
Operating income |  | 4,724 | 3,508 | 7,788 | 9,088
Nonoperating expense, net |  | 2,725 | (304) |  | 1,371
Earnings before income taxes |  | 1,999 | 3,812 | 9,011 | 7,717
Non-cash GKE inventory step-up amortization |  |  | 454 |  | 1,232
Nonoperating (income), net |  | (2,725) | 304 |  | (1,371)
Sterilization and Disinfection Control [Member] | Operating Segments [Member] |  |  |  |  |
Revenues (a): | [1] | 22,107 | 22,205 | 47,517 | 45,162
Depreciation in cost of revenues |  | 461 | 374 | 911 | 793
Amortization in cost of revenues |  | 140 | 134 | 279 | 245
Other cost of revenues (b) | [2] | 6,636 | 6,071 | 13,291 | 12,162
Total segment cost of revenues |  | 7,237 | 7,033 | 14,481 | 14,432
Gross Profit (c) | [3] | 14,870 | 15,172 | 33,036 | 30,730
Non-cash GKE inventory step-up amortization |  |  | 454 |  | 1,232
Biopharmaceutical Development [Member] | Operating Segments [Member] |  |  |  |  |
Revenues (a): | [1] | 13,920 | 11,867 | 25,406 | 23,875
Depreciation in cost of revenues |  | 66 | 40 | 155 | 86
Amortization in cost of revenues |  | 375 | 346 | 747 | 691
Other cost of revenues (b) | [2] | 5,350 | 4,314 | 10,069 | 7,972
Total segment cost of revenues |  | 5,791 | 4,700 | 10,971 | 8,749
Gross Profit (c) | [3] | 8,129 | 7,167 | 14,435 | 15,126
Non-cash GKE inventory step-up amortization |  |  | 0 |  | 0
Calibration Solutions [Member] | Operating Segments [Member] |  |  |  |  |
Revenues (a): | [1] | 13,570 | 12,262 | 25,920 | 24,063
Depreciation in cost of revenues |  | 112 | 207 | 217 | 392
Amortization in cost of revenues |  | 0 | 0 | 0 | 0
Other cost of revenues (b) | [2] | 5,223 | 4,845 | 10,426 | 9,219
Total segment cost of revenues |  | 5,335 | 5,052 | 10,643 | 9,611
Gross Profit (c) | [3] | 8,235 | 7,210 | 15,277 | 14,452
Non-cash GKE inventory step-up amortization |  |  | 0 |  | 0
Clinical Genomics [Member] | Operating Segments [Member] |  |  |  |  |
Revenues (a): | [1] | 11,140 | 11,499 | 21,437 | 22,903
Depreciation in cost of revenues |  | 152 | 283 | 318 | 495
Amortization in cost of revenues |  | 192 | 192 | 383 | 383
Other cost of revenues (b) | [2] | 4,699 | 5,118 | 9,214 | 9,629
Total segment cost of revenues |  | 5,043 | 5,593 | 9,915 | 10,507
Gross Profit (c) | [3] | $ 6,097 | 5,906 | $ 11,522 | 12,396
Non-cash GKE inventory step-up amortization |  |  | $ 0 |  | $ 0
[1] | Intersegment revenues are not significant and are eliminated to arrive at consolidated totals. Revenues as presented are consistent with GAAP measurement principles and our CODM's review of segment information.
[2] | Other segment cost of revenues for each reportable segment includes product costs, personnel costs (including stock-based compensation), and other manufacturing and overhead costs necessary to produce and sell our products and services, excluding depreciation, amortization and any non-cash inventory step-up amortization expense.
[3] | Gross profit as presented is consistent with GAAP measurement principles and our CODM's review of segment information.

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