Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Fair Value Measurements (Details Textual)

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