Note 7 - Accrued Expenses (Details Textual) $ in Millions	Dec. 31, 2022 USD ($)
Accrued Manufacturing Expenses	$ 8.8
Accrued Clinical Expenses	1.3
Manufacture and Purchase of CTX-009 [Member]
Contractual Obligation, Total	$ 6.4

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

No definition available.

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant