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Earnings per share
3 Months Ended
Mar. 31, 2019
Earnings per common share:  
Earnings per share
Note 15 - Earnings per share

Basic and diluted earnings per share are calculated as follows:

   
Three-Month Period Ended March 31,
 
   
2019
   
2018
 
   
US$
   
US$
 
             
Numerator:
           
Net income
   
10,980,715
     
19,099,901
 
                 
Less:
               
Earnings allocated to participating Series D convertible preferred stock
   
(2,624,264
)
   
(4,638,091
)
Earnings allocated to participating nonvested shares
   
-
     
(46,703
)
Net income for basic and dilutive earnings per share
   
8,356,451
     
14,415,107
 
                 
Denominator:
               
Denominator for basic and diluted earnings per share
   
50,948,841
     
49,727,731
 
                 
Earnings per share:
               
Basic and diluted
   
0.16
     
0.29
 
 
The following table summarizes potentially dilutive securities excluded from the calculation of diluted earnings per share for the three-month periods ended March 31, 2019 and 2018 because their effects are anti-dilutive:

 
Three-Month Period Ended March 31,
 
 
2019
 
2018
 
         
Shares issuable upon conversion of Series D convertible preferred stock
   
16,000,000
     
16,000,000