Note 12 - Income Taxes - Government Assistance - Government Assistance (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Receivables [Abstract]
Investment tax credit	$ 356	$ 412

The amount of investment tax credit receivable as of the balance sheet date.

No definition available.

Name:	acst_InvestmentTaxCreditReceivable
Namespace Prefix:	acst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant