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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value and Estimated Fair Value (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Carrying Value    
Carrying value and estimated fair value of financial instruments    
Cash and Cash Equivalents $ 7,153,369 $ 7,779,562
Restricted Cash 4,727,381 9,855,469
Long-Term Debt 168,709,961 166,245,201
Carrying Value | Commercial loans    
Carrying value and estimated fair value of financial instruments    
Loan Investments 23,960,467 23,960,467
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 7,153,369 7,779,562
Restricted Cash 4,727,381 9,855,469
Estimated Fair Value | Significant Other Observable Inputs (Level 2)    
Carrying value and estimated fair value of financial instruments    
Long-Term Debt 173,362,131 171,111,337
Estimated Fair Value | Commercial loans | Significant Other Observable Inputs (Level 2)    
Carrying value and estimated fair value of financial instruments    
Loan Investments $ 24,171,333 $ 24,228,242