Cash dividend paid.

No definition available.

Name:	avd_CashDividendPaid
Namespace Prefix:	avd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	avd_DividendsLineItems
Namespace Prefix:	avd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

Name:	us-gaap_DividendPayableDateToBePaidDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

+ Details

Name:	us-gaap_DividendsPayableAmountPerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

Cash Dividends - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended			6 Months Ended					1 Months Ended
	Jun. 30, 2013	Apr. 19, 2013	Apr. 16, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 10, 2013	Mar. 11, 2013	Mar. 08, 2012	Jul. 19, 2013 Subsequent Event
Dividends [Line Items]
Cash dividend declared						$ 0.05	$ 0.07	$ 0.05
Dividend distributed date	Jul. 19, 2013			Apr. 19, 2013	Apr. 16, 2012
Cash dividend record date	Jul. 05, 2013			Apr. 05, 2013	Apr. 01, 2012
Cash dividends paid		$ 1,976	$ 1,380						$ 1,413