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Schedule of Deferred Consideration Recognized (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Business Combinations [Abstract] |  |
Short-term | $ 1,004 | $ 1,244
Long-term | 1,464 |
Total contingent consideration | $ 2,468 | $ 1,244

X
- Definition Business combination deferred contingent consideration recognized. + References No definition available. + Details
Name: | avd_BusinessCombinationDeferredContingentConsiderationRecognized
Namespace Prefix: | avd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Business combination deferred contingent consideration recognized current. + References No definition available. + Details
Name: | avd_BusinessCombinationDeferredContingentConsiderationRecognizedCurrent
Namespace Prefix: | avd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Business combination deferred contingent consideration recognized noncurrent. + References No definition available. + Details
Name: | avd_BusinessCombinationDeferredContingentConsiderationRecognizedNoncurrent
Namespace Prefix: | avd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_BusinessCombinationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration