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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 04, 2022 | Sep. 05, 2017 | Dec. 31, 2022
Leksell Gamma Knife Icon Systems and Linear Accelerator System [Member] |  |  |
Long-term Install Service and Purchase Commitment, Amount |  |  | $ 13,243,000
Long-term Commitment, Cash on Hand to Fund |  |  | 12,453,000
Long-term Commitment, Line of Credit to Fund |  |  | 7,000,000
LINAC System [Member] |  |  |
Long-Term Service Commitment, Amount |  |  | $ 15,374,000
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
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 | 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_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: |