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v3.25.3

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: |