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Note 14 - Subsequent Events (Details Textual) $ in Thousands | Jan. 29, 2025 USD ($) a | Jan. 23, 2025 USD ($) | Jan. 20, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | --- | --- | ---
Lessee, Operating Lease, Liability, to be Paid, Total |  |  |  | $ 57
Subsequent Event [Member] | Detect [Member] | TRACER [Member] |  |  |  |
Contract with Customer, Liability, Current |  | $ 429 |  |
Donley Facilities [Member] | Subsequent Event [Member] |  |  |  |
Lessee, Operating Lease, Initial Monthly Rent |  |  | $ 14,186 |
Metric Facility [Member] | Subsequent Event [Member] |  |  |  |
Area of Real Estate Property (Square Foot) | a | 17,628 |  |  |
Lessee, Operating Lease, Liability, to be Paid, Total | $ 3,200 |  |  |

X
- Definition The Initial amount of rent per month for the operating lease of the lessee. + References No definition available. + Details
Name: | astc_LesseeOperatingLeaseInitialMonthlyRent
Namespace Prefix: | astc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
Name: | us-gaap_ContractWithCustomerLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details
Name: | us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
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: | srt_ConsolidatedEntitiesAxis=astc_DetectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=astc_TracerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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