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Stockholders' Equity
3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Stockholders' Equity
(7)
Stockholders’ Equity
 
The changes in stockholders’ equity for the three months ended March 31, 2018 and 2019 are as follows:
 
 
 
Three months ended March 31,
 
 
 
2018
 
 
2019
 
Beginning balance
 
$
286,166,200
 
 
$
275,034,091
 
Change in accounting principle
 
 
 
 
 
(935,916
)
Issuance of common stock
 
 
 
 
 
1,172,625
 
Stock-based compensation
 
 
617,772
 
 
 
584,574
 
Purchase of treasury stock
 
 
(13,540,448
)
 
 
(19,826
)
Net income (loss)
 
 
(3,161,192
)
 
 
1,353,263
 
Cash dividends
 
 
(1,366,922
)
 
 
(1,387,832
)
Other comprehensive loss
 
 
(731,265
)
 
 
 
Ending balance
 
$
267,984,145
 
 
$
275,800,979