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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