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Note 8 - Basic and Diluted Net Income (Loss) Per Share (Details Textual) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Weighted Average Number of Shares Outstanding, Basic, Total (in shares) | 3,875,431 | 3,875,431 | 3,875,431 | 3,875,431
Weighted Average Number of Shares Outstanding, Assuming Dilution (in shares) |  | 3,892,948 |  | 3,909,706

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- Definition Represents the average number of shares or units issued and outstanding, including antidilutive shares. + References No definition available. + Details
Name: | awx_WeightedAverageNumberOfSharesOutstandingAssumingDilution
Namespace Prefix: | awx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1448-109256 + Details
Name: | us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration