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Note 12 - Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
      2017       2018       2019  
Income:                        
Net loss, continuing operations    
(6,944,261
 )    
(663,396
 )    
(1,682,671
 )
Dividends to Series B preferred shares    
(1,808,811
 )    
(1,335,733
 )    
(1,271,782
 )
Preferred deemed dividend    
-
      
-
      
(504,577
 )
Net loss attributable to common shareholders, continuing operations    
(8,753,072
 )    
(1,999,129
 )    
(3,459,030
 )
Weighted average common shares –outstanding , basic and diluted    
1,383,440
      
1,414,775
      
2,861,928
  
Basic and diluted loss per share, continuing operations    
(6.33
 )    
(1.41
 )    
(1.21
 )
Net income attributable to common shareholders, discontinued operations    
849,701
      
554,506
      
-
  
Net loss attributable to common shareholders    
(7,903,371
 )    
(1,444,623
 )    
(3,459,030
 )
Basic and diluted loss per share    
(5.72
 )    
(1.02
 )    
(1.21
 )