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Note 9 - Commitments (Details Textual) - USD ($)		3 Months Ended	6 Months Ended
	Sep. 04, 2022	Mar. 31, 2023	Jun. 30, 2023
Leksell Gamma Knife Icon Systems and Linear Accelerator System [Member]
Long-term Install Service and Purchase Commitment, Amount			$ 21,722,000
Long-term Commitment, Cash on Hand to Fund			13,794,000
Long-term Commitment, Line of Credit to Fund			7,000,000
LINAC System [Member]
Long-Term Service Commitment, Amount			$ 14,962,000
LINAC System [Member] | Maximum [Member]
Long-Term Service Commitment, Period (Year)			9 years
LINAC System [Member] | Minimum [Member]
Long-Term Service Commitment, Period (Year)			5 years
Mevion PBRT Units [Member] | Upgrade and Purchase MEVION Systems [Member]
Long-term Purchase Commitment, Amount		$ 34,000,000
Potential Removal Costs Related to Leased Equipment [Member] | Leksell Gamma Knife Icon Systems and Linear Accelerator System [Member]
Long-term Install Service and Purchase Commitment, Amount			$ 950,000
Mevion Medical Systems Inc [Member] | Maintenance And Support Agreement, Mevion Service Agreement [Member]
Purchase Agreement Annual Prepayment	$ 1,800,000
Long-term Purchase Commitment, Period (Year)	1 year

X

- Definition

The amount of cash on hand to fund long-term commitment.

+ References

No definition available.

+ Details

Name:	ams_LongtermCommitmentCashOnHandToFund
Namespace Prefix:	ams_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of line of credit to fund long-term commitment.

+ References

No definition available.

+ Details

Name:	ams_LongtermCommitmentLineOfCreditToFund
Namespace Prefix:	ams_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The minimum amount the entity agreed to spend under the long-term install service and purchase commitment.

+ References

No definition available.

+ Details

Name:	ams_LongtermInstallServiceAndPurchaseCommitmentAmount
Namespace Prefix:	ams_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of long-term service commitment.

+ References

No definition available.

+ Details

Name:	ams_LongtermServiceCommitmentAmount
Namespace Prefix:	ams_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The period of the long-term service commitment.

+ References

No definition available.

+ Details

Name:	ams_LongtermServiceCommitmentPeriod
Namespace Prefix:	ams_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of annual prepayments under purchase agreement.

+ References

No definition available.

+ Details

Name:	ams_PurchaseAgreementAnnualPrepayment
Namespace Prefix:	ams_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermPurchaseCommitmentPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=ams_LeksellGammaKnifeIconSystemsAndLinearAcceleratorSystemMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=ams_LINACSystemMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ams_MevionPbrtUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=ams_UpgradeAndPurchaseMevionSystemsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ams_PotentialRemovalCostsRelatedToLeasedEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ams_MevionMedicalSystemsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=ams_MaintenanceAndSupportAgreementMevionServiceAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: