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Stockholders' Equity
3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Stockholders' Equity
(5)
Stockholders’ Equity
The changes in stockholders’ equity for the three months ended March 31, 2019 and 2020 are as follows:
 
   
Three months ended March 31,
 
   
2019
   
2020
 
Beginning balance
  $275,034,091   $284,471,958 
Change in accounting principle
   (935,916    
Issuance of common stock
   1,172,625     
Stock-based compensation
   584,574    266,439 
Purchase of treasury stock
   (19,826   (15,875
Net income (loss)
   1,353,263    (8,946,163
Cash dividends
   (1,387,832   (1,398,321
  
 
 
   
 
 
 
Ending balance
  $275,800,979   $274,378,038