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Note 4 - Revenue Recognition (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Revenue Recognition Disclosure [Abstract]
Product Return Rate, Percentage	1.20%	1.40%
Increase Decrease In Provisions For Product Returns	$ (1.3)
Increase (Decrease) in Sales Returns, Goods	$ 1.0	$ 0.9

X

- Definition

Represents the increase (decrease) in provisions for product returns.

+ References

No definition available.

+ Details

Name:	amph_IncreaseDecreaseInProvisionsForProductReturns
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The increase (decrease) in refunds recognized during an accounting period due to goods returned by customers (other than under warranty provisions). Returns are a deduction from gross revenue in arriving at net revenue.

+ References

No definition available.

+ Details

Name:	amph_IncreaseDecreaseInSalesReturnsGoods
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the aggregate product return rate percentage of qualified sales.

+ References

No definition available.

+ Details

Name:	amph_ProductReturnRatePercentage
Namespace Prefix:	amph_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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