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Stockholders' Equity - Schedule of Changes in Stockholders Equity (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Beginning balance	$ 275,800,979	$ 267,984,145	$ 275,034,091	$ 286,166,200
Change in accounting principle			(935,916)
Issuance of common stock			1,172,625
Stock-based compensation	547,616	703,404	1,132,190	1,321,176
Purchase of treasury stock	(11,258)	(43,354)	(31,084)	(13,583,802)
Net income	4,269,001	4,918,612	5,622,264	1,757,420
Cash dividends	(1,388,992)	(1,367,448)	(2,776,824)	(2,734,370)
Other comprehensive loss				(731,265)
Ending balance	$ 279,217,346	$ 272,195,359	$ 279,217,346	$ 272,195,359

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