Note 7 - Retirement Benefits (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
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

Minimum period the individual is required to perform services to be fully vested under the defined contribution plan.

No definition available.

Name:	awx_DefinedContributionPlanEmployersMatchingContributionRequisiteServicePeriod
Namespace Prefix:	awx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration