XML 63 R49.htm IDEA: XBRL DOCUMENT
v3.20.2

Business Risk and Credit Risk Concentration Involving Cash - Additional Information (Details) - Customer | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Risks And Uncertainties [Abstract] |  |
Revenue from number of customers | 1 | 2

X
- Definition Revenue from contract with customers, number of customers. + References No definition available. + Details
Name: | astc_RevenueFromContractWithCustomersNumberOfCustomers
Namespace Prefix: | astc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RisksAndUncertaintiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration