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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value and Estimated Fair Value (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Carrying Value    
Carrying value and estimated fair value of financial instruments    
Cash and Cash Equivalents $ 5,320,493 $ 6,559,409
Restricted Cash 8,477,796 6,508,131
Commercial Loan Investments   11,925,699
Long-Term Debt 177,359,493 195,816,364
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 5,320,493 6,559,409
Restricted Cash 8,477,796 6,508,131
Estimated Fair Value | Significant Other Observable Inputs (Level 2)    
Carrying value and estimated fair value of financial instruments    
Commercial Loan Investments   12,015,628
Long-Term Debt $ 179,384,960 $ 200,000,776