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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value and Estimated Fair Value (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Carrying Value    
Carrying value and estimated fair value of financial instruments    
Cash and Cash Equivalents $ 5,944,544 $ 7,779,562
Restricted Cash 7,027,196 9,855,469
Commercial Loan Investments 11,910,611 23,960,467
Commercial Loan Investments - Held for Sale 15,000,000  
Long-Term Debt 173,651,530 166,245,201
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 5,944,544 7,779,562
Restricted Cash 7,027,196 9,855,469
Estimated Fair Value | Significant Other Observable Inputs (Level 2)    
Carrying value and estimated fair value of financial instruments    
Commercial Loan Investments 12,025,860 24,228,242
Commercial Loan Investments - Held for Sale 15,181,779  
Long-Term Debt $ 178,222,572 $ 171,111,337