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Stockholders' Equity - Schedule of Changes in Stockholders Equity (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Equity [Abstract]        
Beginning balance $ 272,195,359 $ 211,719,400 $ 286,166,200 $ 202,491,623
Issuance of common stock 29,888   29,888  
Stock-based compensation 457,454 541,982 1,778,630 1,513,677
Purchase of treasury stock (17,093) (28,408) (13,600,895) (506,410)
Net income 2,631,776 6,070,204 4,389,196 17,462,221
Cash dividends (1,367,761) (1,286,010) (4,102,131) (3,857,060)
Other comprehensive loss   (1,180) (731,265) (88,063)
Ending balance $ 273,929,623 $ 217,015,988 $ 273,929,623 $ 217,015,988