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Note 5 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2022 | Oct. 31, 2021 | Oct. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | May 31, 2021 | Apr. 06, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Oct. 31, 2018
Interest Expense, Total |  |  |  | $ 3,409 | $ 4,416 |  |  |  |  |  |
Income Tax Expense (Benefit), Total |  |  |  | (1,598) | 5,944 |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  |  |  | 22,600 |  |  |  |  |  |  |
Payment for Contingent Consideration Liability, Financing Activities |  |  |  | 700 | (0) |  |  |  |  |  |
Acquisition of Asuragen, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  |  |  | 18,300 |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  | 105,000 |  |  |  | $ 105,000 |  |  |
B-MoGen [Member] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  | 38,000 |  |  |  |  |  |  |
QT Holdings Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Payment for Contingent Consideration Liability, Financing Activities |  |  |  | 4,000 |  |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Total |  |  |  | 2,091 | 2,769 |  |  |  |  |  |
Income Tax Expense (Benefit), Total |  |  |  | (493) | $ (637) |  |  |  |  |  |
Designated as Hedging Instrument [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Total |  |  |  | 2,100 |  |  |  |  |  |  |
Income Tax Expense (Benefit), Total |  |  |  | (500) |  |  |  |  |  |  |
Forward Starting Swap [Member] | Other Current Liabilities [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Current |  |  |  | 200 |  | $ 800 |  |  |  |  |
Forward Starting Swap [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  |  |  | $ 380,000
Derivative Notional Amount, Decrease in Period |  |  | $ 100,000 |  |  |  |  |  |  |  |
Forward Starting Swap [Member] | Cash Flow Hedging [Member] | Other Noncurrent Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative Notional Amount, Dedesignated |  |  |  |  |  |  |  |  | $ 80,000 | $ 80,000 |
Hedging Liabilities, Noncurrent |  |  |  | 6,200 |  | 7,600 |  |  |  |  |
Forward Starting Swap [Member] | Cash Flow Hedging [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative Notional Amount, Decrease in Period | $ 200,000 | $ 80,000 |  |  |  |  |  |  |  |  |
New Forward Starting Swap [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  | $ 200,000 |  |  |  |
New Forward Starting Swap [Member] | Cash Flow Hedging [Member] | Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |  |  |  |
Hedging Assets, Noncurrent, Total |  |  |  | 500 |  | 300 |  |  |  |  |
CCXI [Member] |  |  |  |  |  |  |  |  |  |  |
Investments, Total |  |  |  | 6,600 |  |  |  |  |  | $ 6,600 |
Investments, Fair Value Disclosure, Total |  |  |  | $ 1,500 |  | $ 1,400 |  |  |  |  |

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