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OPERATING LEASES (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Leased Assets [Line Items] |  |  |
Operating Leases, Rent Expense | $ 301,000 us-gaap_LeaseAndRentalExpense | $ 549,000 us-gaap_LeaseAndRentalExpense | $ 438,000 us-gaap_LeaseAndRentalExpense
Operating Leases Cumulative Loss |  | 115,000 ams_OperatingLeasesCumulativeLoss |
Operating Leases, Rent Expense, Net | $ 173,000 us-gaap_OperatingLeasesRentExpenseNet | $ 116,000 us-gaap_OperatingLeasesRentExpenseNet |

X
- Definition Amount of cumulative loss due to subleased. + References No definition available. + Details
Name: | ams_OperatingLeasesCumulativeLoss
Namespace Prefix: | ams_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration