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Stockholders' Equity - Schedule of Changes in Stockholders Equity (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Beginning balance $ 274,378,038 $ 275,800,979 $ 284,471,958 $ 275,034,091
Issuance of common stock       1,172,625
Stock-based compensation 199,264 547,616 465,703 1,132,190
Purchase of treasury stock (16,044) (11,258) (31,919) (31,084)
Net income (loss) (18,167,797) 4,269,001 (27,113,960) 5,622,264
Cash dividends   (1,388,992) (1,398,321) (2,776,824)
Noncontrolling interest created in consolidation 667,654   667,654  
Ending balance $ 257,061,115 $ 279,217,346 $ 257,061,115 279,217,346
Change in accounting principle [Member]        
Beginning balance       $ (935,916)