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Note 13 - Shareholders' Equity (Details Textual) | 12 Months Ended
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Dec. 31, 2023 shares
Number of Class A Common Stock Convertible with Each Class B Common Stock (in shares) | 1
Common Class A [Member] |
Common Stock, Votes Per Share | 1
Common Class B [Member] |
Common Stock, Votes Per Share | 10

X
- Definition The number of votes per share of common stock. + References No definition available. + Details
Name: | awx_CommonStockVotesPerShare
Namespace Prefix: | awx_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares convertible with each class of common stock. + References No definition available. + Details
Name: | awx_NumberOfClassACommonStockConvertibleWithEachClassBCommonStock
Namespace Prefix: | awx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |