Note 10 - Subsequent Event (Details Textual) $ in Millions	Jul. 31, 2021 USD ($)
3D Medicines, Inc [Member] \| Subsequent Event [Member]
Collaborative Agreement, Expected Milestone Payments to be Received	$ 3

The amount of expected milestone payments to be received under the collaborative agreement.

No definition available.

Name:	arav_CollaborativeAgreementExpectedMilestonePaymentsToBeReceived
Namespace Prefix:	arav_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant