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Note 17 - Litigation (Details) (Enoxaparin Patent Litigation [Member], Momenta and Sandoz [Member], USD $)	0 Months Ended	9 Months Ended		0 Months Ended
	Oct. 31, 2011 Pending Litigation [Member]	Sep. 30, 2014 Pending Litigation [Member]	Sep. 21, 2011 Pending Litigation [Member]	Jan. 24, 2014 Judicial Ruling [Member]
Note 17 - Litigation (Details) [Line Items]
Number of Alleged Patent Infringements			2
Litigation, Plaintiff Preliminary Injunction Bond, Amount	$ 100,100,000
Litigation Settlement, Expense				40,000
Loss Contingency, Damages Sought, Value		$ 100,100,000

X

- Definition

Represents the amount of bond to be posted by the plaintiff as a result of a court issued preliminary injunction.

+ References

No definition available.

+ Details

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Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	amph_Note17LitigationDetailsLineItems
Namespace Prefix:	amph_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of alleged patent infringements.

+ References

No definition available.

+ Details

Name:	amph_NumberOfAllegedPatentInfringements
Namespace Prefix:	amph_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

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Balance Type:	debit
Period Type:	duration