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Stockholders' Equity - Schedule of Changes in Stockholders Equity (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Beginning balance	$ 275,034,091	$ 286,166,200
Change in accounting principle	(935,916)
Issuance of common stock	1,172,625
Stock-based compensation	584,574	617,772
Purchase of treasury stock	(19,826)	(13,540,448)
Net income (loss)	1,353,263	(3,161,192)
Cash dividends	(1,387,832)	(1,366,922)
Other comprehensive loss		(731,265)
Ending balance	$ 275,800,979	$ 267,984,145

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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