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Note 10 - Related Party Transactions (Details Textual)	Jun. 30, 2023 USD ($)
US Subsidiary Of Elekta Member
Purchase Obligation	$ 25,511,000
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_RelatedPartyTransactionsByRelatedPartyAxis=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: