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Note 11 - Long-term Incentive Plan (Details Textual) - USD ($)
xbrli-pure in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Oct. 06, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 760,000   760,000     760,000  
Avalon Holdings Corporation 2009 Long Term Incentive Plan Member              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         760,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     5 years        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 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%        
Allocated Share-based Compensation Expense, Total $ 1,000 $ 3,000 $ 5,000 $ 10,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 24,000   $ 24,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     5 years 244 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