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Note 8 - Basic and Diluted Net Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
2019
    
2018
  
Net loss attributable to Avalon Holdings Corporation common shareholders
   $
(455
 )   $
(1,144
 )
                 
Shares used in computing basic loss per share
    
3,875
      
3,814
  
Potentially dilutive shares from stock options
    
-
      
-
  
Shares used in computing diluted loss per share
    
3,875
      
3,814
  
                 
Loss per share attributable to Avalon Holdings Corporation common shareholders
                
Basic and diluted net loss per share
   $
(0.12
 )   $
(0.30
 )