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ACCOUNTING POLICIES (Details Textual) | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 Noncontrolling Interest [Member] USD ($) | Dec. 31, 2014 Additional Paid-in Capital [Member] USD ($) | Jun. 10, 2014 EWRS [Member] USD ($) | Dec. 31, 2014 EWRS [Member] USD ($) | Dec. 31, 2014 EWRS [Member] EUR (€) | Dec. 31, 2014 Sale of EWRS Turkey [Member] USD ($) | Dec. 31, 2014 Certificates of Deposit [Member] USD ($) | Dec. 31, 2013 Certificates of Deposit [Member] USD ($) | Dec. 31, 2014 Mevion Medical Systems Inc [Member] | Dec. 31, 2014 Maximum [Member] USD ($) | Dec. 31, 2013 Maximum [Member] USD ($) | Dec. 31, 2012 Maximum [Member] USD ($) | Dec. 31, 2014 Minimum [Member] USD ($) | Dec. 31, 2013 Minimum [Member] USD ($) | Dec. 31, 2012 Minimum [Member] USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Amount Outstanding During Period | $ 9,000,000 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod | $ 9,000,000 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod |  |  |  |  |  |  |  | $ 9,000,000 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember | $ 9,000,000 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember |  |  |  |  |  |  |
Interest Costs Capitalized | 371,000 us-gaap_InterestCostsCapitalized | 390,000 us-gaap_InterestCostsCapitalized | 196,000 us-gaap_InterestCostsCapitalized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease, Net, Total | 82,151,000 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet | 86,712,000 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease, Accumulated Depreciation | 46,138,000 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation | 43,805,000 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost Method Investments | 2,709,000 us-gaap_CostMethodInvestments | 2,701,000 us-gaap_CostMethodInvestments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 633,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 576,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 588,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Transaction Gain, before Tax | 161,000 us-gaap_ForeignCurrencyTransactionGainBeforeTax | 1,174,000 us-gaap_ForeignCurrencyTransactionGainBeforeTax | 132,000 us-gaap_ForeignCurrencyTransactionGainBeforeTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost Method Investment Interest Percentage |  |  |  |  |  |  |  |  |  |  |  | 0.77%ams_CostMethodInvestmentInterestPercentage / us-gaap_CashAndCashEquivalentsAxis = ams_MevionMedicalSystemsIncMember |  |  |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  | 3 |  |
Stock Options Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.16 ams_StockOptionsExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 6.50 ams_StockOptionsExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 6.50 ams_StockOptionsExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 2.43 ams_StockOptionsExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 2.30 ams_StockOptionsExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 2.76 ams_StockOptionsExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember
Cumulative Translation Adjustment, Net of Tax, Period Increase (Decrease) |  |  |  |  |  |  | 779,000 us-gaap_CumulativeTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ams_EwrsMember |  |  |  |  |  |  |  |  |  |  |
Payments for (Proceeds from) Investments | 6,000,000 us-gaap_PaymentsForProceedsFromInvestments |  |  |  |  |  |  | 4,200,000 us-gaap_PaymentsForProceedsFromInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ams_EwrsMember |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Stock in Subsidiary | (572,000)us-gaap_GainOrLossOnSaleOfStockInSubsidiary | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary |  |  | 572,000 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ams_EwrsMember |  |  |  |  |  |  |  |  |  |  |  |
Warrants Issued With Promissory Notes During The Period | 200,000 ams_WarrantsIssuedWithPromissoryNotesDuringPeriod |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 2.20 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Interest in Consolidated Subsidiaries | 768,000 us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries | 0 us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries | 0 us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries |  |  |  |  |  | 768,000 us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ams_SaleOfEwrsTurkeyMember |  |  |  |  |  |  |  |  |
Fair Value of Assets Acquired | 700,000 us-gaap_FairValueOfAssetsAcquired | 0 us-gaap_FairValueOfAssetsAcquired | 0 us-gaap_FairValueOfAssetsAcquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges | 0 us-gaap_AssetImpairmentCharges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising Expense | 155,000 us-gaap_AdvertisingExpense | 119,000 us-gaap_AdvertisingExpense | 103,000 us-gaap_AdvertisingExpense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  | $ 400,000 us-gaap_PriorPeriodReclassificationAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 235,000 us-gaap_PriorPeriodReclassificationAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |  |  |  |  |  |

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