Annual report pursuant to Section 13 and 15(d)

Leased Properties and Leases - Sale of the Portland Terminal Facility (Details)

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Leased Properties and Leases - Sale of the Portland Terminal Facility (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 21, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from the sale of leased property           $ 55,553,975 $ 0 $ 0
Gain on sale of leased property   $ 11,723,257 $ 0 $ 0 $ 0 11,723,257 0 $ 0
Deferred rent receivable   25,942,755       25,942,755 22,060,787  
Joliet Terminal                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Investments             $ 1,200,000  
Realized loss on sale of investment $ 715,000              
Disposed of by Sale, Not Discontinued Operations | Zenith Energy Terminals Holdings | Portland Terminal Facility and Joliet Terminal                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Disposal consideration 61,000,000              
Proceeds from the sale of leased property 56,000,000              
Note receivable 5,000,000              
Disposed of by Sale, Not Discontinued Operations | Zenith Energy Terminals Holdings | Portland Terminal Facility                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Disposal consideration 60,600,000              
Disposal consideration if sold to third party within 6 months, more than 60,000,000              
Gain on sale of leased property           11,700,000    
Deferred rent receivable   $ 3,200,000       $ 3,200,000    
Disposed of by Sale, Not Discontinued Operations | Zenith Energy Terminals Holdings | Joliet Terminal                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Disposal consideration 400,000              
Portland Terminal Facility                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Property investment $ 45,700,000