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Note 16 - Subsequent Events (Details Textual) - USD ($) $ in Thousands | Nov. 11, 2022 | Nov. 09, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Lessee, Operating Lease, Liability, to be Paid, Total |  |  | $ 171
Subsequent Event [Member] |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 1,000 |
Subsequent Event [Member] | Offices in Austin, Texas [Member] |  |  |
Lessee, Operating Lease, Liability, to be Paid, Total | $ 87 |  |

X
- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=astc_OfficesInAustinTexasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |