Annual report pursuant to Section 13 and 15(d)

Fair Value - Joliet (Details)

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Fair Value - Joliet (Details) - USD ($)
Dec. 21, 2018
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other equity securities, at fair value   $ 0 $ 2,958,315
Zenith Terminal Joliet Holdings      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity interest percentage     0.60%
Sale of investment $ 446,000