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Note 13 - License and Collaboration Agreements (Details Textual) - MD Anderson [Member] - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended
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Jan. 31, 2021 | Jun. 30, 2023
Collaboration Agreement, Term (Year) | 3 years |
Research and Development Arrangement, Contract to Perform for Others, Costs Incurred, Gross |  | $ 2

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- Definition The term of the collaboration agreement. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of costs incurred under a research and development arrangement accounted for as a contract to perform research and development for others. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 730 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483041/730-20-50-1 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |