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v3.25.2

Note 8 - Business Risk and Credit Risk Concentration Involving Cash (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024
Cash, Uninsured Amount | $ 2.6 |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |
Number Of Customers | 4 | 3
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |
Number Of Customers | 2 | 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_SalesRevenueNetMember
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: |