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Investments in Joint Ventures - Summary of the Financial Information for Equity Accounted Investments (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Current assets $ 48,053,524 $ 77,932,439  
Non-current assets 895,952,783 876,256,492  
Current liabilities 63,061,107 67,136,139  
Long-term liabilities 316,348,785 327,866,152  
Revenues 145,003,021 144,259,312 $ 164,330,202
Operating income/(loss) 23,341,950 21,709,008 10,541,651
Net income/(loss) 11,984,485 2,093,124 $ (12,276,520)
Space Gas Inc [Member]      
Schedule of Equity Method Investments [Line Items]      
Current assets 2,163,484 2,237,644  
Non-current assets 12,559,048 13,221,364  
Current liabilities 1,118,776 1,426,128  
Long-term liabilities 4,855,255 5,530,995  
Revenues 3,222,037 3,362,478  
Operating income/(loss) 451,895 1,122,467  
Net income/(loss) 246,616 854,885  
Financial Power Inc [Member]      
Schedule of Equity Method Investments [Line Items]      
Current assets 2,359,816 1,745,681  
Non-current assets 12,575,608 13,229,810  
Current liabilities 1,491,243 1,583,998  
Long-term liabilities 4,855,255 5,530,995  
Revenues 3,481,799 3,281,896  
Operating income/(loss) 935,869 477,559  
Net income/(loss) 728,428 212,498  
Cannes View Inc [Member]      
Schedule of Equity Method Investments [Line Items]      
Current assets 1,267,542 2,560,065  
Non-current assets 13,801,972 14,532,274  
Current liabilities 1,440,769 1,702,293  
Long-term liabilities 7,050,860 7,792,274  
Revenues 2,764,359 2,707,338  
Operating income/(loss) (645,197) 872,331  
Net income/(loss) (1,019,886) 627,671  
ColoradoOiland Gas Inc [Member]      
Schedule of Equity Method Investments [Line Items]      
Current assets 1,126,697 2,265,263  
Non-current assets 12,335,790 12,801,053  
Current liabilities 2,688,747 2,488,495  
Long-term liabilities 6,169,497 6,818,237  
Revenues 2,704,455 2,032,648  
Operating income/(loss) (817,717) (85,071)  
Net income/(loss) (1,155,342) (303,415)  
Frost Investments Corp Inc [Member]      
Schedule of Equity Method Investments [Line Items]      
Current assets 10,831,800 13,693,747  
Non-current assets 19,464,419 20,396,424  
Current liabilities 2,575,067 2,653,152  
Long-term liabilities 9,384,573 10,757,210  
Revenues 6,866,426 2,047,026  
Operating income/(loss) 3,122,539 (370,748)  
Net income/(loss) 2,656,770 $ (420,191)  
MGC Aggressive Holdings Inc [Member]      
Schedule of Equity Method Investments [Line Items]      
Current assets 5,096,668    
Non-current assets 82,809,937    
Current liabilities 8,315,433    
Long-term liabilities 40,958,366    
Revenues 18,409,814    
Operating income/(loss) 4,869,260    
Net income/(loss) $ 3,882,812