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ACCOUNTING POLICIES (Details Textual)
 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
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 $ 9,000,000us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod $ 9,000,000us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod               $ 9,000,000us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CertificatesOfDepositMember		 $ 9,000,000us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CertificatesOfDepositMember		              
Interest Costs Capitalized 371,000us-gaap_InterestCostsCapitalized 390,000us-gaap_InterestCostsCapitalized 196,000us-gaap_InterestCostsCapitalized                              
Property Subject to or Available for Operating Lease, Net, Total 82,151,000us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet 86,712,000us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet                                
Property Subject to or Available for Operating Lease, Accumulated Depreciation 46,138,000us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation 43,805,000us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation                                
Cost Method Investments 2,709,000us-gaap_CostMethodInvestments 2,701,000us-gaap_CostMethodInvestments                                
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 633,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 576,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 588,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount                              
Foreign Currency Transaction Gain, before Tax 161,000us-gaap_ForeignCurrencyTransactionGainBeforeTax 1,174,000us-gaap_ForeignCurrencyTransactionGainBeforeTax 132,000us-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                         $ 6.16ams_StockOptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 6.50ams_StockOptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 6.50ams_StockOptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 2.43ams_StockOptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 2.30ams_StockOptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 2.76ams_StockOptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Cumulative Translation Adjustment, Net of Tax, Period Increase (Decrease)             779,000us-gaap_CumulativeTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ams_EwrsMember		                      
Payments for (Proceeds from) Investments 6,000,000us-gaap_PaymentsForProceedsFromInvestments             4,200,000us-gaap_PaymentsForProceedsFromInvestments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ams_EwrsMember		                    
Gain (Loss) on Disposition of Stock in Subsidiary (572,000)us-gaap_GainOrLossOnSaleOfStockInSubsidiary 0us-gaap_GainOrLossOnSaleOfStockInSubsidiary 0us-gaap_GainOrLossOnSaleOfStockInSubsidiary     572,000us-gaap_GainOrLossOnSaleOfStockInSubsidiary
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ams_EwrsMember		                        
Warrants Issued With Promissory Notes During The Period 200,000ams_WarrantsIssuedWithPromissoryNotesDuringPeriod                                  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 2.20us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1                                  
Proceeds from Divestiture of Interest in Consolidated Subsidiaries 768,000us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries 0us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries 0us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries           768,000us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ams_SaleOfEwrsTurkeyMember		                  
Fair Value of Assets Acquired 700,000us-gaap_FairValueOfAssetsAcquired 0us-gaap_FairValueOfAssetsAcquired 0us-gaap_FairValueOfAssetsAcquired                              
Asset Impairment Charges 0us-gaap_AssetImpairmentCharges                                  
Advertising Expense 155,000us-gaap_AdvertisingExpense 119,000us-gaap_AdvertisingExpense 103,000us-gaap_AdvertisingExpense                              
Prior Period Reclassification Adjustment       $ 400,000us-gaap_PriorPeriodReclassificationAdjustment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 $ 235,000us-gaap_PriorPeriodReclassificationAdjustment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember