Note 4 - Trade Receivables - Summary of Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	$ 8,268	$ 1,980
Billed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	7,959	310
Unbilled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	309	1,670
U.S. Department of Health and Human Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	7,502	1,675
U.S. Department of Health and Human Services | Billed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	7,218	5
U.S. Department of Health and Human Services | Unbilled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	284	1,670
Royalty receivables from partners
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	741	305
Royalty receivables from partners | Billed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	741	305
Royalty receivables from partners | Unbilled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	0	$ 0
Other collaborations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	25
Other collaborations | Billed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	0
Other collaborations | Unbilled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	$ 25