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Royalties - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) LicenseAgreement	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Royalty expense | $	$ 81	$ 83	$ 111
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_
Data Type:	xbrli:integerItemType
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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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Balance Type:	debit
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