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Note 7 - Retirement Benefits (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 100.00% |
Defined Contribution Plan, Employers Matching Contribution, Requisite Service Period | 5 years |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 0 | $ 0

X
- Definition Minimum period the individual is required to perform services to be fully vested under the defined contribution plan. + References No definition available. + Details
Name: | awx_DefinedContributionPlanEmployersMatchingContributionRequisiteServicePeriod
Namespace Prefix: | awx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration