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Note 16 - Segment Data - Operating Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Revenues | [1] |  |  |  |  |  |  |  |  | $ 133,937 | $ 117,687 | $ 103,135
Gross profit |  | $ 24,736 | $ 20,653 | $ 21,285 | $ 20,340 | $ 18,769 | $ 14,803 | $ 15,586 | $ 16,204 | 87,014 | 65,362 | 60,916
Operating expenses |  |  |  |  |  |  |  |  |  | 74,656 | 57,439 | 51,135
Operating income |  |  |  |  |  |  |  |  |  | 12,358 | 7,923 | 9,781
Nonoperating expense, net |  |  |  |  |  |  |  |  |  | (10,055) | (4,061) | (1,158)
Earnings before income taxes |  |  |  |  |  |  |  |  |  | 2,303 | 3,862 | 8,623
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 17,660 | 12,990 | 9,428
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,992 | 1,498 | 1,262
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [1] |  |  |  |  |  |  |  |  | 133,937 | 115,224 | 96,228
Gross profit |  |  |  |  |  |  |  |  |  | 87,017 | 64,944 | 60,309
Operating expenses |  |  |  |  |  |  |  |  |  | 74,656 | 57,439 | 51,135
Operating income |  |  |  |  |  |  |  |  |  | 12,358 | 7,923 | 9,781
Nonoperating expense, net |  |  |  |  |  |  |  |  |  | 10,055 | 4,061 | 1,158
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 2,704 | 2,081 | 1,381
Capital expenditures |  |  |  |  |  |  |  |  |  | 843 | 890 | 694
Operating Segments [Member] | Sterilization and Disinfection Control [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [1] |  |  |  |  |  |  |  |  | 53,119 | 49,660 | 46,297
Gross profit |  |  |  |  |  |  |  |  |  | 39,870 | 35,797 | 31,861
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 857 | 902 | 902
Capital expenditures |  |  |  |  |  |  |  |  |  | 136 | 291 | 384
Operating Segments [Member] | Instruments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [1] |  |  |  |  |  |  |  |  | 32,465 | 37,984 | 36,125
Gross profit |  |  |  |  |  |  |  |  |  | 20,158 | 24,247 | 22,866
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 164 | 179 | 207
Capital expenditures |  |  |  |  |  |  |  |  |  | 128 | 165 | 56
Operating Segments [Member] | Biopharmaceutical Development [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [1] |  |  |  |  |  |  |  |  | 33,892 | 13,851 | 0
Gross profit |  |  |  |  |  |  |  |  |  | 21,035 | 382 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,427 | 672 | 0
Capital expenditures |  |  |  |  |  |  |  |  |  | 539 | 233 | 0
Operating Segments [Member] | Cold Chain Monitoring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [1] |  |  |  |  |  |  |  |  | 14,461 | 13,729 | 13,806
Gross profit |  |  |  |  |  |  |  |  |  | 5,954 | 4,518 | 5,582
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 256 | 328 | 272
Capital expenditures |  |  |  |  |  |  |  |  |  | 40 | 201 | 254
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [2] |  |  |  |  |  |  |  |  | 0 | 2,463 | 6,907
Gross profit | [2] |  |  |  |  |  |  |  |  | (3) | 418 | 607
Depreciation and amortization | [3] |  |  |  |  |  |  |  |  | 14,956 | 10,909 | 8,047
Capital expenditures |  |  |  |  |  |  |  |  |  | $ 1,149 | $ 608 | $ 568
[1] | Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.
[2] | Non-reportable operating segments (including our Cold Chain Packaging Division which ceased operations during the year ended March 31, 2020) and unallocated corporate expenses are reported within Corporate and Other.
[3] | Amortization of intellectual property is included in the calculation of gross margin by segment. Amortization pertaining to other types of intangible assets, such as customer relationships and trademarks, is included in general and administrative on the Consolidated Statements of Income. Within the table above, the depreciation and amortization costs that are included in calculating the gross margin of the noted segment are included; other costs such as amortization that is recorded to general and administrative expense is shown in corporate and other.

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