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Investment in Equity Securities (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Schedule of Cost-method Investments [Line Items]
Equity Method Investments	$ 2,709,000us-gaap_EquityMethodInvestments	$ 2,709,000us-gaap_EquityMethodInvestments
Investment Percentage in Common Stock	0.77%ams_InvestmentPercentageInCommonStock
Unrealized Gain (Loss) on Investments	2,400,000us-gaap_UnrealizedGainLossOnInvestments
Non Refundable Deposits	$ 5,000,000ams_NonRefundableDeposits

X

- Definition

Percentage of investment in interest of common stock.

+ References

No definition available.

+ Details

Name:	ams_InvestmentPercentageInCommonStock
Namespace Prefix:	ams_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents this element non refundable deposits.

+ References

No definition available.

+ Details

Name:	ams_NonRefundableDeposits
Namespace Prefix:	ams_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

+ Details

Name:	us-gaap_EquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_ScheduleOfCostMethodInvestmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration