Note 15 - Impact of COVID-19 Pandemic (Details Textual)	Dec. 31, 2022	Dec. 31, 2021
Percent of Deferred Payroll Tax Amount Paid	100.00%	50.00%

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

No definition available.

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