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Note 9 - Business Risk and Credit Risk Concentration Involving Cash (Details Textual) | 12 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |
Number Of Customers | 2 | 2

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- Definition Represents the number of customers. + References No definition available. + Details
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Namespace Prefix: | astc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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: |