Note 15 - Subsequent Events (Details Textual) - Hsu v. Puma Biotechnology, Inc., [Member] - USD ($) $ in Millions			1 Months Ended
Nov. 02, 2021	Oct. 29, 2021	Jan. 31, 2022
Litigation Settlement, Amount Awarded to Other Party	$ 54.2	$ 54.2
Subsequent Event [Member]
Litigation Settlement, Amount Awarded to Other Party			$ 54.2

Amount awarded to other party in judgment or settlement of litigation.

No definition available.

Name:	us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration