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Note 11 - Long-term Incentive Plan (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 120 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Apr. 25, 2019
Dec. 31, 2018
Oct. 06, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 688,000   688,000   688,000   688,000  
Minimum Percentage of Fair Market Value for Non-qualified Stock Option Price     100.00%          
Share-based Payment Arrangement, Expense $ 1,000 $ 2,000 $ 4,000 $ 5,000        
Ten Percent Shareholders [Member]                
Minimum Percentage of Fair Market Value for Incentive Stock Option Price     110.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years          
Other Employees [Member]                
Minimum Percentage of Fair Market Value for Incentive Stock Option Price     100.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     5 years          
Avalon Holdings Corporation 2009 Long Term Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total         760,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period         72,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 688,000   688,000   688,000      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     5 years          
Number Of Years After Options Vested, Stock Price Reach Predetermined Vesting Price     3 years          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate     0.00%          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 19,000   $ 19,000   $ 19,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     4 years 244 days          
Avalon Holdings Corporation 2009 Long Term Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period     1 year          
Avalon Holdings Corporation 2009 Long Term Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period     180 days          
Avalon Holdings Corporation 2009 Long Term Incentive Plan [Member] | Common Class A [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               1,300,000
The 2019 Long-Term Incentive Plan [Member] | Common Class A [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           1,300,000    
Avalon Holdings Corporation 2009 Long Term Incentive Plan And 2019 Long Term Incentive Plan [Member] | Common Class A [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           1,300,000