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Schedule II - Valuation and Qualifying Accounts - Summary of Property and Equipment and the Related Accumulated Depreciation (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cost Basis    
Balance at beginning of year $ 38,249,655 $ 39,025,000
Additions 813,697
Disposals (7,620,697) (775,000)
Balance at end of year 31,442,720 38,249,655
Accumulated depreciation    
Balance at beginning of year 32,938,000 32,472,000
Depreciation 1,568,697 466,000
Disposals (7,620,697) 0
Balance at end of year $ 26,886,000 $ 32,938,000