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Earnings Per Share - Computation for Earnings Per Share (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net Income $ 17,626,538 $ 13,638,479 $ 31,889,151 $ 11,110,111
Less: Net loss (income) attributable to redeemable noncontrolling interest (761,708) (1,437,789) (1,315,810) 2,620,687
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS $ 16,864,830 $ 12,200,690 $ 30,573,341 $ 13,730,798
Weighted average shares outstanding        
Weighted average number of outstanding shares - Basic (in shares) 3,196,501 3,220,973 3,176,744 3,246,867
Weighted average number of outstanding shares - Diluted (in shares) 3,196,501 3,220,973 3,176,744 3,246,867
Earnings per share        
Basic (USD per share) $ 5.28 $ 3.79 $ 9.62 $ 4.23
Diluted (USD per share) $ 5.28 $ 3.79 $ 9.62 $ 4.23