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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value and Estimated Fair Value (Details) - USD ($)
Jun. 30, 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 $ 10,701,531 $ 6,474,637
Restricted Cash 29,709,862 128,430,049
Carrying Value | Significant Other Observable Inputs (Level 2)    
Carrying value and estimated fair value of financial instruments    
Commercial Loan Investments 18,488,912 34,625,173
Long-Term Debt 270,783,375 287,218,303
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 10,701,531 6,474,637
Restricted Cash 29,709,862 128,430,049
Estimated Fair Value | Significant Other Observable Inputs (Level 2)    
Carrying value and estimated fair value of financial instruments    
Commercial Loan Investments 18,488,912 35,001,997
Long-Term Debt $ 277,037,986 $ 288,830,346