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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
Schedule of Changes in Stockholders Equity
The changes in stockholders’ equity for the three and nine months ended September 30, 2018 and 2019 are as follows:
 
   
Three
M
onths ended September 30,
   
Nine
M
onths ended September 30,
 
   
2018
   
2019
   
2018
   
2019
 
Beginning balance
  $272,195,359   $279,217,346   $286,166,200   $275,034,091 
Change in accounting principle
   —      —      —      (935,916
Issuance of common stock
   29,888    —      29,888    1,172,625 
Stock-based compensation
   457,454    602,508    1,778,630    1,734,698 
Purchase of treasury stock
   (17,093   (5,588   (13,600,895   (36,672
Net income
   2,631,776    3,043,899    4,389,196    8,666,163 
Cash dividends
   (1,367,761   (1,389,273   (4,102,131   (4,166,097
Other comprehensive loss
   —      —      (731,265   —   
   
 
 
   
 
 
   
 
 
   
 
 
 
Ending balance
  $273,929,623   $281,468,892   $273,929,623   $281,468,892