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Royalty Expenses - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) LicenseAgreement	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Royalty expense | $	$ 106	$ 137	$ 86
Number of license agreements minimum annual royalty	2
Number of license agreements royalty percentage of annual sales	2

X

- Definition

Number of additional licensing agreements.

+ References

No definition available.

+ Details

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X

- Definition

Number of Licensing Agreements That Require Minimum Annual Royalty Payments.

+ References

No definition available.

+ Details

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Namespace Prefix:	avd_
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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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