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Note 5 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2022 | Oct. 31, 2021 | Oct. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Jun. 30, 2020 | Oct. 31, 2018
Interest Expense, Total |  |  |  | $ 2,660 | $ 4,486 | $ 10,661 | $ 14,580 |  |  |
Nonoperating Income (Expense), Total |  |  |  | (23,272) | (970) | (27,652) | 96,843 |  |  |
Income Tax Expense (Benefit), Total |  |  |  | (48) | $ 10,389 | 16,121 | 44,501 |  |  |
Business Combination, Liabilities Arising from Contingencies, Amount Recognized |  |  |  | 10,800 |  | 10,800 |  |  |  |
QT Holdings Corporation [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  | 51,000 |  | 51,000 |  |  |  |
Business Combination, Liabilities Arising from Contingencies, Amount Recognized |  |  |  | 5,300 |  | 5,300 |  |  |  |
B-MoGen [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  | 38,000 |  | 38,000 |  |  |  |
Business Combination, Liabilities Arising from Contingencies, Amount Recognized |  |  |  | 5,500 |  | 5,500 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |
Interest Expense, Total |  |  |  |  |  | 6,662 | 2,102 |  |  |
Nonoperating Income (Expense), Total |  |  |  |  |  | 512 |  |  |  |
Income Tax Expense (Benefit), Total |  |  |  |  |  | (1,670) | (488) |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Designated as Hedging Instrument [Member] | AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |
Interest Expense, Total |  |  |  |  |  | 6,700 | 2,100 |  |  |
Nonoperating Income (Expense), Total |  |  |  |  |  | (500) |  |  |  |
Income Tax Expense (Benefit), Total |  |  |  |  |  | (1,700) | $ (500) |  |  |
Embedded Derivative Financial Instruments [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  |  | $ 380,000
Derivative Notional Amount, Decrease in Period |  |  | $ 100,000 |  |  |  |  |  |  |
Embedded Derivative Financial Instruments [Member] | Cash Flow Hedging [Member] | Other Noncurrent Liabilities [Member] |  |  |  |  |  |  |  |  |  |
Derivative Notional Amount, Dedesignated |  |  |  |  |  |  |  | $ 80,000 | $ 80,000 |
Derivative, Fair Value, De-designed |  |  |  | 1,400 |  | 1,400 |  |  |  |
Embedded Derivative Financial Instruments [Member] | Cash Flow Hedging [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |
Derivative Notional Amount, Decrease in Period | $ 200,000 | $ 80,000 |  |  |  |  |  |  |  |
CCXI [Member] |  |  |  |  |  |  |  |  |  |
Investments, Total |  |  |  | 6,600 |  | 6,600 |  |  | 6,600 |
Investments, Fair Value Disclosure, Total |  |  |  | $ 6,500 |  | $ 6,500 |  |  | $ 8,000 |

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