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Note 10 - Related Party Transactions and Balances (Details Textual) | Mar. 31, 2024 USD ($)
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US Subsidiary Of Elekta Member |
Purchase Obligation | $ 16,625,000
GKF Subsidiary [Member] |
Noncontrolling Interest, Ownership Percentage by Parent | 81.00%
US Subsidiary Of Elekta Member |
Noncontrolling Interest, Ownership Percentage by Parent | 19.00%

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=ams_USSubsidiaryOfElektaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=ams_GKFSubsidiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=ams_USSubsidiaryOfElektaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |