Note 8 - Subsequent Events (Details Textual)	Apr. 14, 2020 shares
i2China Mgt LLC [Member] \| Subsequent Event [Member]
Class Of Warrants Cancelled Expired In Period (in shares)	452,617

The number of warrants cancelled or expired in period.

No definition available.

Name:	amar_ClassOfWarrantsCancelledExpiredInPeriod
Namespace Prefix:	amar_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration