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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, 2018
Dec. 31, 2017
Cost Basis    
Balance at beginning of year $ 31,442,720 $ 38,250,000
Additions 492,000 813,697
Disposals (7,620,697)
Balance at end of year 31,935,436 31,442,720
Accumulated depreciation    
Balance at beginning of year 26,879,000 32,938,000
Depreciation 1,241,000 1,568,697
Disposals (7,620,697)
Balance at end of year $ 28,120,000 $ 26,879,000