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Note 3 - Revenue (Details Textual) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
Note 3 - Revenue (Details Textual) $ in Thousands	Aug. 31, 2023 USD ($)	Jan. 31, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2017	Sep. 30, 2023 USD ($)	May 19, 2021 USD ($)	Feb. 08, 2018	May 02, 2017
Increase in Contract With Customer Liability			$ 0		$ 0
Decrease in Contract with Customer, Liability			$ 0	$ 19,900	$ 0	$ 21,600
Amendment of the Second Seagen Amendment [Member]
Revenue from Contract with Customer, Excluding Assessed Tax							$ 10,100
Genentech [Member]
Number Of Initial Research Programs											2
Contract with Customer, Liability, Revenue Recognized				12,500
Number Of Optional Additional Research Programs											2
B P Assets X I I Inc [Member] \| Exclusive Product License Agreement [Member]
Contract with Customer, Milestone Payment Received	$ 2,500
Seattle Genetics Inc. [Member] \| License and Collaboration Agreement [Member]
Number of Research Programs												3
Seattle Genetics Inc. [Member] \| Collaborative Arrangement [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 5,000						$ 5,000
Astra Zeneca A B [Member] \| License and Collaboration Agreement [Member]
Contract with Customer, Liability, Revenue Recognized				$ 4,000
Contract with Customer, Liability, Current										$ 3,500
Astra Zeneca A B [Member] \| License and Collaboration Agreement [Member] \| Maximum [Member]
Number of Collaboration Products													4
Astra Zeneca A B [Member] \| License and Collaboration Agreement [Member] \| Minimum [Member]
Number of Collaboration Products													2
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Les Laboratoires Servier And Institut De Recherches Internationales Servier [Member] \| License and Collaboration Agreement [Member]
Contract with Customer, Liability, Current							$ 4,700
Number of Programs									5
License [Member] \| Genentech [Member]
Contract with Customer, Liability, Total											$ 20,000