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FAIR VALUE OF FINANCIAL INSTRUMENTS - Assets Measured on a Nonrecurring Basis (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
a
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
a
Dec. 31, 2016
USD ($)
a
Fair value of financial instruments        
Impairment charges $ 1,970,822   $ 2,180,730  
Undeveloped Land        
Fair value of financial instruments        
Impairment charges   $ 0 $ 1,000,000  
Land Under Contract for Sale | Undeveloped Land        
Fair value of financial instruments        
Area of Land | a 6   6 8
Impairment charges       $ 1,000,000
Nonrecurring basis        
Fair value of assets        
Asset fair value   $ 0