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Note 10 - Business Risk and Credit Risk Concentration Involving Cash (Details Textual) - Customer Concentration Risk [Member] | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Revenue Benchmark [Member] |  |  |  |
Number Of Customers | 1 | 2 | 3 | 3
Accounts Receivable [Member] |  |  |  |
Number Of Customers |  |  | 1 | 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
- 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: |