Note 4 - Receivables - Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024
Notes To Financial Statements [Abstract]
Sales tax receivables	$ 373	$ 316
Government assistance	0	356
Interest receivable	5	15
Other receivables	20	35
Total receivables	$ 398	$ 722

GrantsAndInvestmentTaxCreditReceivable

No definition available.

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

- Definition

Notes To Financial Statements Abstract

+ References

No definition available.

+ Details

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Namespace Prefix:	acst_
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Balance Type:	na
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- Definition

Carrying amount as of the balance sheet date of sales taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

+ References

No definition available.

+ Details

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

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

+ Details

Name:	us-gaap_AccountsReceivableNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant