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Stockholders' Equity - Schedule of Changes in Stockholders Equity (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Beginning balance	$ 279,217,346	$ 272,195,359	$ 275,034,091	$ 286,166,200
Change in accounting principle			(935,916)
Issuance of common stock		29,888	1,172,625	29,888
Stock-based compensation	602,508	457,454	1,734,698	1,778,630
Purchase of treasury stock	(5,588)	(17,093)	(36,672)	(13,600,895)
Net income	3,043,899	2,631,776	8,666,163	4,389,196
Cash dividends	(1,389,273)	(1,367,761)	(4,166,097)	(4,102,131)
Other comprehensive loss				(731,265)
Ending balance	$ 281,468,892	$ 273,929,623	$ 281,468,892	$ 273,929,623

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