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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
OPERATING ACTIVITIES      
Net (loss) income $ (562,000)us-gaap_ProfitLoss $ (113,000)us-gaap_ProfitLoss $ 813,000us-gaap_ProfitLoss
Adjustments to reconcile net (loss) income to net cash from operating activities:      
Depreciation and amortization 6,383,000us-gaap_DepreciationDepletionAndAmortization 6,410,000us-gaap_DepreciationDepletionAndAmortization 6,096,000us-gaap_DepreciationDepletionAndAmortization
(Gain) loss on disposal of assets (1,000)us-gaap_GainLossOnDispositionOfAssets 20,000us-gaap_GainLossOnDispositionOfAssets 3,000us-gaap_GainLossOnDispositionOfAssets
Loss on sale of subsidiary 572,000us-gaap_GainOrLossOnSaleOfStockInSubsidiary 0us-gaap_GainOrLossOnSaleOfStockInSubsidiary 0us-gaap_GainOrLossOnSaleOfStockInSubsidiary
Deferred income tax 76,000us-gaap_DeferredIncomeTaxExpenseBenefit 59,000us-gaap_DeferredIncomeTaxExpenseBenefit 25,000us-gaap_DeferredIncomeTaxExpenseBenefit
(Gain) loss on foreign currency transactions (161,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized 1,174,000us-gaap_ForeignCurrencyTransactionGainLossUnrealized (132,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Stock-based compensation expense 138,000us-gaap_ShareBasedCompensation 88,000us-gaap_ShareBasedCompensation 74,000us-gaap_ShareBasedCompensation
Other non-cash items 107,000us-gaap_OtherNoncashIncomeExpense 0us-gaap_OtherNoncashIncomeExpense 0us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:      
Receivables 1,069,000us-gaap_IncreaseDecreaseInAccountsReceivable (643,000)us-gaap_IncreaseDecreaseInAccountsReceivable 655,000us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses and other assets 11,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 58,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (316,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued liabilities (859,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 1,023,000us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (349,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Net cash from operating activities 6,773,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 8,076,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 6,869,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
INVESTING ACTIVITIES      
Payment for purchase of property and equipment (5,212,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,710,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (6,634,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Investment in equity securities (8,000)us-gaap_PaymentsToAcquireMarketableSecurities (14,000)us-gaap_PaymentsToAcquireMarketableSecurities (31,000)us-gaap_PaymentsToAcquireMarketableSecurities
Proceeds from sale of subsidiary 768,000us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries 0us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries 0us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries
Net cash used in investing activities (4,452,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (1,724,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (6,665,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
FINANCING ACTIVITIES      
Principal payments on long-term debt (3,263,000)us-gaap_RepaymentsOfLongTermDebt (3,523,000)us-gaap_RepaymentsOfLongTermDebt (6,818,000)us-gaap_RepaymentsOfLongTermDebt
Principal payments on capital leases (4,429,000)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (3,476,000)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (3,732,000)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Proceeds from long-term debt financing on property and equipment 2,625,000us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt 1,298,000us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt 9,219,000us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt
Advances on line of credit 1,140,000us-gaap_ProceedsFromLongTermLinesOfCredit 369,000us-gaap_ProceedsFromLongTermLinesOfCredit 1,300,000us-gaap_ProceedsFromLongTermLinesOfCredit
Payments on line of credit (1,200,000)us-gaap_RepaymentsOfLongTermLinesOfCredit (79,000)us-gaap_RepaymentsOfLongTermLinesOfCredit (600,000)us-gaap_RepaymentsOfLongTermLinesOfCredit
Capital contributions from non-controlling interests 117,000us-gaap_ProceedsFromMinorityShareholders 184,000us-gaap_ProceedsFromMinorityShareholders 217,000us-gaap_ProceedsFromMinorityShareholders
Distributions to non-controlling interests (951,000)us-gaap_PaymentsToMinorityShareholders (792,000)us-gaap_PaymentsToMinorityShareholders (780,000)us-gaap_PaymentsToMinorityShareholders
Private placements of common stock 1,800,000us-gaap_PaymentsForRepurchaseOfPrivatePlacement 0us-gaap_PaymentsForRepurchaseOfPrivatePlacement 0us-gaap_PaymentsForRepurchaseOfPrivatePlacement
Common stock repurchase (2,000)us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock (28,000)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from promissory notes 1,000,000us-gaap_ProceedsFromNotesPayable 0us-gaap_ProceedsFromNotesPayable 0us-gaap_ProceedsFromNotesPayable
Net cash used in financing activities (3,163,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (6,019,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (1,222,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net change in cash and cash equivalents (842,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 333,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,018,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Effect of changes in foreign exchange rates on cash (8,000)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 12,000us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 2,000us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
CASH AND CASH EQUIVALENTS, beginning of year 1,909,000us-gaap_CashAndCashEquivalentsAtCarryingValue 1,564,000us-gaap_CashAndCashEquivalentsAtCarryingValue 2,580,000us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS, end of year 1,059,000us-gaap_CashAndCashEquivalentsAtCarryingValue 1,909,000us-gaap_CashAndCashEquivalentsAtCarryingValue 1,564,000us-gaap_CashAndCashEquivalentsAtCarryingValue
SUPPLEMENTAL CASH FLOW DISCLOSURE      
Cash paid for interest 2,070,000us-gaap_InterestPaid 2,116,000us-gaap_InterestPaid 2,352,000us-gaap_InterestPaid
Cash paid for income taxes 41,000us-gaap_IncomeTaxesPaid 44,000us-gaap_IncomeTaxesPaid 158,000us-gaap_IncomeTaxesPaid
SCHEDULE OF NONCASH INVESTING AND FINANCING ACTIVITIES      
Acquisition of equipment with capital lease financing 3,709,000us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1 3,478,000us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1 264,000us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1
Warrants issued with promissory notes 145,000ams_FairValueOfWarrantsIssuedWithPromissoryNotes 0ams_FairValueOfWarrantsIssuedWithPromissoryNotes 0ams_FairValueOfWarrantsIssuedWithPromissoryNotes
Nonmonetary equipment trade-in 700,000us-gaap_FairValueOfAssetsAcquired 0us-gaap_FairValueOfAssetsAcquired 0us-gaap_FairValueOfAssetsAcquired
Equipment relieved in sale of subsidiary (4,921,000)ams_EquipmentRelievedInSaleOfSubsidiary 0ams_EquipmentRelievedInSaleOfSubsidiary 0ams_EquipmentRelievedInSaleOfSubsidiary
Other assets relieved in sale of subsidiary (826,000)ams_OtherAssetsRelievedInSaleOfSubsidiary 0ams_OtherAssetsRelievedInSaleOfSubsidiary 0ams_OtherAssetsRelievedInSaleOfSubsidiary
Debt relieved in sale of subsidiary 5,181,000ams_DebtRelievedInSaleOfSubsidiary 0ams_DebtRelievedInSaleOfSubsidiary 0ams_DebtRelievedInSaleOfSubsidiary
Other liabilities relieved in sale of subsidiary 14,000ams_OtherLiabilitiesRelievedInSaleOfSubsidiary 0ams_OtherLiabilitiesRelievedInSaleOfSubsidiary 0ams_OtherLiabilitiesRelievedInSaleOfSubsidiary
Net equity relieved in sale of subsidiary 1,351,000ams_NetEquityReleivedInSaleOfSubsidiary 0ams_NetEquityReleivedInSaleOfSubsidiary 0ams_NetEquityReleivedInSaleOfSubsidiary
OCI released to net income in sale of subsidiary (779,000)ams_OciReleasedToNetIncomeInSaleOfSubsidiary 0ams_OciReleasedToNetIncomeInSaleOfSubsidiary 0ams_OciReleasedToNetIncomeInSaleOfSubsidiary
Investment released to net income in sale of subsidiary $ (1,360,000)ams_InvestmentReleasedToNetIncomeInSaleOfSubsidiary $ 0ams_InvestmentReleasedToNetIncomeInSaleOfSubsidiary $ 0ams_InvestmentReleasedToNetIncomeInSaleOfSubsidiary