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Note 16 - Subsequent Events (Details Textual)	Nov. 09, 2023
Subsequent Event [Member]
Number of Tracers	7

X

- Definition

Amount of tracers

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: