Note 4 - Sale of Future Payments (Details Textual) - XOMA [Member] $ in Millions	1 Months Ended
Jan. 31, 2024 USD ($)
Proceeds From Sale of Receivables	$ 8.0
Proceeds from Debt, Net of Issuance Costs	$ 6.6

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

Name:	us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration