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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of Changes in Stockholders Equity
The changes in stockholders’ equity for the three and six months ended June 30, 2018 and 2019 are as follows:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three months ended June 30,
 
 
Six months ended June 30,
 
 
 
2018
 
 
2019
 
 
2018
 
 
2019
 
Beginning balance
 
$
267,984,145
 
 
$
275,800,979
 
 
$
286,166,200
 
 
$
275,034,091
 
Change in accounting principle
 
 
—
 
 
 
—
 
 
 
—
 
 
 
(935,916
)
Issuance of common stock
 
 
—
 
 
 
—
 
 
 
—
 
 
 
1,172,625
 
Stock-based compensation
 
 
703,404
 
 
 
547,616
 
 
 
1,321,176
 
 
 
1,132,190
 
Purchase of treasury stock
 
 
(43,354
)
 
 
(11,258
)
 
 
(13,583,802
)
 
 
(31,084
)
Net income
 
 
4,918,612
 
 
 
4,269,001
 
 
 
1,757,420
 
 
 
5,622,264
 
Cash dividends
 
 
(1,367,448
)
 
 
(1,388,992
)
 
 
(2,734,370
)
 
 
(2,776,824
)
Other comprehensive loss
 
 
—
 
 
 
—
 
 
 
(731,265
)
 
 
—
 
Ending balance
 
$
272,195,359
 
 
$
279,217,346
 
 
$
272,195,359
 
 
$
279,217,346