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Cost Method Investment - Additional Information (Detail)	Jun. 30, 2016
Bi-PA
Schedule of Cost-method Investments [Line Items]
Cost method ownership percentage	15.00%

X

- Definition

Cost Method Ownership Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	avd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=avd_BiPaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: