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Note 15 - Business Segment Information (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019
Corporate, Non-Segment [Member] |  |
Increase (Decrease) in Total Assets | $ 0.8 |
Waste Management Services [Member] |  |
Increase (Decrease) in Total Assets | 0.3 |
Golf and Related Operations [Member] |  |
Increase (Decrease) in Total Assets | $ 2.5 |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |
Number of Major Customers | 0 | 0
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Waste Management Services [Member] |  |
Number of Major Customers | 1 | 1
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Golf and Related Operations [Member] |  |
Number of Major Customers | 1 | 1

X
- Definition The increase (decrease) during the reporting period in total assets. + References No definition available. + Details
Name: | awx_IncreaseDecreaseInTotalAssets
Namespace Prefix: | awx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc. + References No definition available. + Details
Name: | awx_NumberOfMajorCustomers
Namespace Prefix: | awx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=awx_WasteManagementServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=awx_GolfAndRelatedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |