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Note 15 - Impact of COVID-19 Pandemic (Details Textual)	Mar. 31, 2022
Number of Repayment Installments	2
Percent of Deferred Payroll Tax Amount Paid	50.00%

X

- Definition

The number of installments anticipated to repay the deferred payroll tax liability.

+ References

No definition available.

+ Details

Name:	astc_NumberOfRepaymentInstallments
Namespace Prefix:	astc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percent of total deferred payroll tax liability paid as of reporting date.

+ References

No definition available.

+ Details

Name:	astc_PercentOfDeferredPayrollTaxAmountPaid
Namespace Prefix:	astc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant