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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value and Estimated Fair Value (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
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 $ 18,593,046 $ 6,474,637
Restricted Cash 2,910,392 128,430,049
Carrying Value | Significant Other Observable Inputs (Level 2)    
Carrying value and estimated fair value of financial instruments    
Commercial Loan Investments 39,658,204 34,625,173
Long-Term Debt 313,372,702 287,218,303
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 18,593,046 6,474,637
Restricted Cash 2,910,392 128,430,049
Estimated Fair Value | Significant Other Observable Inputs (Level 2)    
Carrying value and estimated fair value of financial instruments    
Commercial Loan Investments 39,658,204 35,001,997
Long-Term Debt $ 318,513,813 $ 288,830,346