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Subsequent Events - Additional Information (Detail) - Subsequent Event shares in Thousands, $ in Thousands | Apr. 01, 2020 USD ($) shares
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Subsequent Event [Line Items] |
Amount paid for common shares purchased | $ 2,500
Equity investment ownership position | 8.00%
Number of shares purchased | shares | 6,250
Up-front royalty payment | $ 2,500

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- Definition Stock purchased during period shares. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Up-front royalty payment + References No definition available. + Details
Name: | avd_UpFrontRoyaltyPayment
Namespace Prefix: | avd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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Period Type: | instant

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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Period Type: |