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Basis of Presentation (Details Textual)	3 Months Ended	12 Months Ended			1 Months Ended		3 Months Ended
	Mar. 31, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 31, 2015 EWRS Turkey [Member]	May 31, 2014 Sale of EWRS Turkey [Member] USD ($)	May 31, 2014 Sale of EWRS Turkey [Member] EUR (€)	Mar. 31, 2015 Sale of EWRS Turkey [Member] USD ($)
Basis Of Presentation [Line Items]
Equity Method Investment, Ownership Percentage				100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = ams_EwrsTurkeyMember
Foreign Currency Transaction Gain, before Tax	$ 15,000us-gaap_ForeignCurrencyTransactionGainBeforeTax
Proceeds from Divestiture of Interest in Consolidated Subsidiaries							768,000us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries / us-gaap_NoncashOrPartNoncashDivestituresByUniqueNameAxis = ams_SaleOfEwrsTurkeyMember
Divestiture of Subsidiary, Gross Sale value					6,000,000ams_DivestitureOfSubsidiaryGrossSaleValue / us-gaap_NoncashOrPartNoncashDivestituresByUniqueNameAxis = ams_SaleOfEwrsTurkeyMember	4,200,000ams_DivestitureOfSubsidiaryGrossSaleValue / us-gaap_NoncashOrPartNoncashDivestituresByUniqueNameAxis = ams_SaleOfEwrsTurkeyMember
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent, Total		779,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	(142,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Income (Loss) from Subsidiaries, Net of Tax							$ 572,000us-gaap_IncomeLossFromSubsidiariesNetOfTax / us-gaap_NoncashOrPartNoncashDivestituresByUniqueNameAxis = ams_SaleOfEwrsTurkeyMember

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- Definition

Gross sale value from divestiture of business.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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Amount before tax of foreign currency transaction realized and unrealized gain recognized in the income statement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount after tax of income (loss) of subsidiary attributable to the parent entity.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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