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Earnings Per Share - Computation for Earnings Per Share (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]        
Net Income $ 11,140,583 $ 11,516,637 $ 22,250,694 $ 45,230,053
Less: Net loss (income) attributable to redeemable noncontrolling interest (575,068) (99,177) 2,045,619 (3,684,799)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS $ 10,565,515 $ 11,417,460 $ 24,296,313 $ 41,545,254
Weighted average shares outstanding        
Weighted average number of outstanding shares - Basic (in shares) 3,200,957 3,411,632 3,231,452 3,460,959
Dilutive impact of restricted stock units (in shares) 0 0 0 200
Weighted average number of outstanding shares - Diluted (in shares) 3,200,957 3,411,632 3,231,452 3,461,159
Earnings per share        
Basic (USD per share) $ 3.30 $ 3.35 $ 7.52 $ 12.00
Diluted (USD per share) $ 3.30 $ 3.35 $ 7.52 $ 12.00