Note 15 - Impact of COVID-19 Pandemic (Details Textual)	3 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Percent of Deferred Payroll Tax Amount Paid		100.00%
Excise and Sales Taxes Percentage	1.00%

The amount of excise and sales taxes included in sales and revenues, which are then deducted as a cost of sales. Includes excise taxes, which are applied to specific types of transactions or items (such as gasoline or alcohol); and sales, use and value added taxes, which are applied to a broad class of revenue-producing transactions involving a wide range of goods and services.

No definition available.

Name:	astc_ExciseAndSalesTaxesPercentage
Namespace Prefix:	astc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration