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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value and Estimated Fair Value (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Carrying Value | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Carrying value and estimated fair value of financial instruments    
Cash and Cash Equivalents $ 6,474,637 $ 2,310,489
Restricted Cash 128,430,049 19,721,475
Carrying Value | Significant Other Observable Inputs (Level 2)    
Carrying value and estimated fair value of financial instruments    
Commercial Loan Investments 34,625,173  
Long-Term Debt 287,218,303 247,624,811
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Carrying value and estimated fair value of financial instruments    
Cash and Cash Equivalents 6,474,637 2,310,489
Restricted Cash 128,430,049 19,721,475
Estimated Fair Value | Significant Other Observable Inputs (Level 2)    
Carrying value and estimated fair value of financial instruments    
Commercial Loan Investments 35,001,997  
Long-Term Debt $ 288,830,346 $ 248,765,650