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Stockholders' Equity
 6 Months Ended
Jun. 30, 2022
Equity [Abstract]  
Stockholders' Equity
(6)
Stockholders’ Equity
The changes in stockholders’ equity for the three and six months ended June 30, 2021 and 2022 are as follows:
 
    
Three months ended June 30,
     
Six months ended June 30,
  
    
2021
     
2022
     
2021
     
2022
  
Beginning balance
    $ 252,739,797      $ 259,689,019      $ 267,101,820      $ 263,082,298  
Stock-based compensation
      402,199        378,830        923,000        606,080  
Acquisition of noncontrolling interest
      —          —          (4,490,130 )       —    
Purchase of treasury stock
      (22,471 )       (76,108 )       (807,373 )       (105,707 ) 
Net income (loss)
      187,694        (14,454,717 )       (10,496,947 )       (18,045,647 ) 
Elimination of noncontrolling interest
      —          —          1,076,849        —    
    
 
 
     
 
 
     
 
 
     
 
 
  
Ending balance
    $ 253,307,219      $ 245,537,024      $ 253,307,219      $ 245,537,024