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Note 11 - Business Risk and Credit Risk Concentration Involving Cash (Details Textual) $ in Millions	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025 USD ($)
Cash, Uninsured Amount			$ 2.1
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number Of Customers	3	1

X

- Definition

Represents the number of customers.

+ References

No definition available.

+ Details

Name:	astc_NumberOfCustomers
Namespace Prefix:	astc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: