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Note 8 - Basic and Diluted Net Income (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
2020
    
2019
  
Net income (loss) attributable to Avalon Holdings Corporation common shareholders
   $
14
     $
(455
 )
                 
Shares used in computing basic income (loss) per share
    
3,876
      
3,875
  
Potentially dilutive shares from stock options
    
2
      
-
  
Shares used in computing diluted income (loss) per share
    
3,878
      
3,875
  
                 
Income (loss) per share attributable to Avalon Holdings Corporation common shareholders
                
Basic net income (loss) per share
   $
0.00
     $
(0.12
 )
Diluted net income (loss) per share
   $
0.00
     $
(0.12
 )