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Note 7 - Customer and Supplier Concentration (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Risks and Uncertainties [Abstract] |  |  |  |
Number of Major Customers | 4 | 4 | 4 | 4

X
- Definition Represents the number of major customers. + References No definition available. + Details
Name: | amph_NumberOfMajorCustomers
Namespace Prefix: | amph_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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