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Note 4 - Acquisitions (Details Textual) - Acquisition of Asuragen, Inc. [Member] - USD ($) $ in Thousands |  | 6 Months Ended
--- | --- | ---
Apr. 06, 2021 | Sep. 30, 2021
Payments to Acquire Businesses, Net of Cash Acquired, Total | $ 215,587 |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | $ 105,000 | $ 105,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | 7,600
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | $ 3,200
Developed Technology Rights [Member] |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 14 years |
Customer Relationships [Member] |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 16 years |
Trade Names [Member] |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 5 years |
Noncompete Agreements [Member] |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 3 years |

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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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