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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