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v2.4.0.6

MAJOR CUSTOMERS (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2012 Customers | Dec. 31, 2011 Customers | Dec. 31, 2010 Customers
Entity-Wide Revenue, Major Customer, Percentage |  | 25.00% | 13.00%
Revenue from Number of Customer | 19 | 21 | 19
Customer 1 [Member] |  |  |
Entity-Wide Revenue, Major Customer, Percentage | 13.00% |  |
Customer 2 [Member] |  |  |
Entity-Wide Revenue, Major Customer, Percentage | 11.00% |  |

X
- Definition Revenue from number of customers to the entity. + References No definition available. + Details
Name: | ams_RevenueFromNumberOfCustomer
Namespace Prefix: | ams_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration