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Note 1 - Significant Accounting Policies - Summary of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2019
Revenues	$ 49,959	$ 2,871	$ 69,018	$ 7,694
Torii Pharmaceutical Co. [Member]
Revenues				1,335	$ 20,101
Product [Member]
Revenues	33,430	0	51,301	218
Product [Member] | ORLADEYO [Member]
Revenues	28,374	0	39,312	0
Product [Member] | PERAMIVIR [Member]
Revenues	434	0	7,254	218
Product [Member] | RAPIVAB [Member]
Revenues	4,622	0	4,735	0
Royalty [Member]
Revenues	128	44	(769)	1,989
Milestone [Member]
Revenues	15,000	0	15,000	0
Collaborative and Other Research and Development [Member]
Revenues	1,401	2,827	3,486	5,487
Collaborative and Other Research and Development [Member] | US Department of Health and Human Services [Member]
Revenues	1,401	2,545	3,486	4,152
Collaborative and Other Research and Development [Member] | Torii Pharmaceutical Co. [Member]
Revenues	$ 0	$ 282	$ 0	$ 1,335

X

- Definition

Amount, including 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.

+ References

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