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Long-term Debt - Schedule of Debt (Detail) - USD ($)
12 Months Ended
Sep. 30, 2019
Mar. 29, 2019
Feb. 19, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]            
Movement Additions       $ 33,480,000    
Repayments $ (3,419,645) $ (1,036,265) $ (625,000) (97,371,978) $ (56,717,059) $ (56,254,073)
Debt Deconsolidation Amount       (13,850,000)    
Term Loans       368,229,303 445,971,281  
Current portion of long-term debt       41,421,346 42,433,562  
Current portion of long-term debt associated with vessels held for sale       0 30,150,000  
Long term debt       326,807,957 373,387,719  
Total debt       368,229,303 445,971,281  
Current portion of deferred finance charges       685,790 706,725  
Current portion of deferred finance charges associated with vessels held for sale       0 73,644  
Deferred finance charges non-current       1,560,055 1,873,466  
Total deferred finance charges       2,245,845 2,653,835  
Total debt       368,229,303 445,971,281  
Less: Total deferred finance charges       2,245,845 2,653,835  
Total debt, net of deferred finance charges       365,983,458 443,317,446  
Less: Current portion of long-term debt, net of current portion of deferred finance charges       40,735,556 41,726,837  
Less: Current portion of long-term debt associated with vessels held for sale, net of current portion of deferred finance charges       0 30,076,356  
Long term debt, net of deferred finance charges       $ 325,247,902 371,514,253  
Term Loan 1 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Feb. 19, 2020    
Drawn Amount       $ 40,250,000    
Movement Additions       0    
Repayments       (11,875,000)    
Debt Deconsolidation Amount       0    
Term Loans       $ 0 11,875,000  
Term Loan 4 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Nov. 04, 2020    
Drawn Amount       $ 33,240,000    
Movement Additions       0    
Repayments       0    
Debt Deconsolidation Amount       (13,850,000)    
Term Loans       $ 0 13,850,000  
Term Loan 2 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Dec. 18, 2023    
Drawn Amount       $ 14,094,184    
Movement Additions       0    
Repayments       (2,200,000)    
Debt Deconsolidation Amount       0    
Term Loans       $ 11,894,184 14,094,184  
Term Loan 20 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Apr. 16, 2024    
Drawn Amount       $ 11,000,000    
Movement Additions       0    
Repayments       (1,340,000)    
Debt Deconsolidation Amount       0    
Term Loans       $ 10,360,000 11,700,000  
Term Loan 21 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Mar. 01, 2024    
Drawn Amount       $ 27,675,000    
Movement Additions       0    
Repayments       (3,300,000)    
Debt Deconsolidation Amount       0    
Term Loans       $ 21,900,000 25,200,000  
Term Loan 6 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Jun. 20, 2020    
Drawn Amount       $ 43,250,000    
Movement Additions       0    
Repayments       (23,375,000)    
Debt Deconsolidation Amount       0    
Term Loans       $ 0 23,375,000  
Term Loan 22 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Jul. 11, 2026    
Drawn Amount       $ 22,230,000    
Movement Additions       22,230,000    
Repayments       (793,929)    
Debt Deconsolidation Amount       0    
Term Loans       $ 21,436,071 0  
Term Loan 23 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Dec. 29, 2022    
Drawn Amount       $ 25,458,432    
Movement Additions       11,250,000    
Repayments       (8,257,649)    
Debt Deconsolidation Amount       0    
Term Loans       $ 18,237,048 15,244,697  
Term Loan 24 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Jul. 31, 2022    
Drawn Amount       $ 50,225,000    
Movement Additions       0    
Repayments       (6,605,000)    
Debt Deconsolidation Amount       0    
Term Loans       $ 29,025,000 35,630,000  
Term Loan 9 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Apr. 16, 2020    
Drawn Amount       $ 30,000,000    
Movement Additions       0    
Repayments       (16,300,000)    
Debt Deconsolidation Amount       0    
Term Loans       $ 0 16,300,000  
Term Loan 11 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Dec. 18, 2023    
Drawn Amount       $ 9,480,000    
Movement Additions       0    
Repayments       (800,000)    
Debt Deconsolidation Amount       0    
Term Loans       $ 8,680,000 9,480,000  
Term Loan 12 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Jan. 08, 2023    
Drawn Amount       $ 20,925,000    
Movement Additions       0    
Repayments       (1,420,000)    
Debt Deconsolidation Amount       0    
Term Loans       $ 14,180,000 15,600,000  
Term Loan 25 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Jun. 30, 2023    
Drawn Amount       $ 67,200,000    
Movement Additions       0    
Repayments       (3,960,000)    
Debt Deconsolidation Amount       0    
Term Loans       $ 47,595,000 51,555,000  
Term Loan 14 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Dec. 14, 2022    
Drawn Amount       $ 22,400,000    
Movement Additions       0    
Repayments       (1,493,328)    
Debt Deconsolidation Amount       0    
Term Loans       $ 16,426,688 17,920,016  
Term Loan 15 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Sep. 03, 2021    
Drawn Amount       $ 22,750,000    
Movement Additions       0    
Repayments       (1,625,000)    
Debt Deconsolidation Amount       0    
Term Loans       $ 15,843,750 17,468,750  
Term Loan 16 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Jul. 07, 2023    
Drawn Amount       $ 25,350,000    
Movement Additions       0    
Repayments       (2,112,500)    
Debt Deconsolidation Amount       0    
Term Loans       $ 16,371,875 18,484,375  
Term Loan 17 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Dec. 11, 2022    
Drawn Amount       $ 22,275,000    
Movement Additions       0    
Repayments       (2,755,000)    
Debt Deconsolidation Amount       0    
Term Loans       $ 16,765,000 19,520,000  
Term Loan 18 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Dec. 31, 2025    
Drawn Amount       $ 65,650,000    
Movement Additions       0    
Repayments       (4,103,320)    
Debt Deconsolidation Amount       0    
Term Loans       $ 56,945,940 61,049,260  
Term Loan 19 [Member]            
Debt Instrument [Line Items]            
Maturity Date       Apr. 17, 2026    
Drawn Amount       $ 70,787,500    
Movement Additions       0    
Repayments       (5,056,252)    
Debt Deconsolidation Amount       0    
Term Loans       $ 62,568,747 $ 67,624,999