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Note 19 - Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Consolidated earnings per share
  
2020
    
2019
  
Loss from continuing operations
   $
(2,507,679
 )   $
(5,972,363
 )
(Gain)/loss attributable to noncontrolling interest
    
(3,423
 )    
292,518
  
Deemed dividends on preferred stock and amortization of beneficial conversion feature
    
(4,380,292
 )    
 
  
Loss from continuing operations attributable to Yunhong CTI Ltd common shareholders
   $
(6,891,394
 )   $
(5,679,845
 )
                 
Loss from discontinued operations
   $
(1,743,182
 )   $
(2,102,084
 )
(Gain)/loss attributable to noncontrolling interest
    
(135,202
 )    
1,239,611
  
Loss from discontinued operations attributable to Yunhong CTI Ltd common shareholders
   $
(1,878,384
 )   $
(862,473
 )
                 
Basic and Diluted loss per common share:
  
 
 
 
  
 
 
 
Continuing operations
   $
(1.46
 )   $
(1.48
 )
Discontinued operations
    
(0.40
 )    
(0.22
 )
    $
(1.77
 )   $
(1.70
 )
                 
Basic and Diluted weighted average number of shares and equivalent shares of common stock outstanding
    
4,705,741
      
3,835,950