Note 2 - Revenue Recognition - Disaggregation of Revenue By Product and Geography (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue	$ 329,004	$ 233,662	$ 2,785
Product [Member]
Revenue	313,728	92,005	2,633
Briumvi Ublituximab [Member]
Revenue	313,700
UNITED STATES \| Product [Member]
Revenue	310,023	88,786	2,633
UNITED STATES \| Briumvi Ublituximab [Member] \| Product [Member]
Revenue	310,023	88,786	0
UNITED STATES \| Ukoniq [Member] \| Product [Member]
Revenue	0	0	2,633
International [Member] \| Product [Member]
Revenue	3,705	3,219	0
International [Member] \| Briumvi Ublituximab [Member] \| Product [Member]
Revenue	3,705	3,219	0
International [Member] \| Ukoniq [Member] \| Product [Member]
Revenue	0	0	0
Worldwide [Member] \| Product [Member]
Revenue	313,728	92,005	2,633
Worldwide [Member] \| Briumvi Ublituximab [Member] \| Product [Member]
Revenue	313,728	92,005	0
Worldwide [Member] \| Ukoniq [Member] \| Product [Member]
Revenue	$ 0	$ 0	$ 2,633

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details