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Research and Development | 12 Months Ended
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Dec. 31, 2012
Research and Development | (10) Research and Development Research and development expenses which are included in operating expenses were $7,648, $6,555 and $5,876 for the years ended December 31, 2012, 2011 and 2010.

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- Definition Research And Development Disclosure [Text Block] + References No definition available. + Details
Name: | avd_ResearchAndDevelopmentDisclosureTextBlock
Namespace Prefix: | avd_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration