Annual report pursuant to Section 13 and 15(d)

SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details)

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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 41,000,000      
Initial Cost to Company, Land 120,355,063      
Initial Cost to Company, Building & Fixtures 412,740,415      
Cost Capitalized Subsequent to Acquisition, Improvements 5,016,742      
Gross Amount Carried at Close of Period, Land 120,355,063      
Gross Amount Carried at Close of Period, Building & Fixtures 417,757,157      
Gross Amount Carried at Close of Period, Total 538,112,220 $ 541,478,086 $ 543,095,478 $ 293,823,903
Accumulated Depreciation 72,155,753 $ 52,219,717 $ 33,869,263 $ 25,295,958
Investment in Real Estate, net 465,956,467      
Pinedale Liquids Gathering System [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 41,000,000      
Initial Cost to Company, Land 105,485,063      
Initial Cost to Company, Building & Fixtures 125,119,062      
Cost Capitalized Subsequent to Acquisition, Improvements 0      
Gross Amount Carried at Close of Period, Land 105,485,063      
Gross Amount Carried at Close of Period, Building & Fixtures 125,119,062      
Gross Amount Carried at Close of Period, Total 230,604,125      
Accumulated Depreciation 44,632,098      
Investment in Real Estate, net $ 185,972,027      
Life on which depreciation in latest income statement is computed 26 years      
Portland Terminal Facility [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company, Land 13,700,000      
Initial Cost to Company, Building & Fixtures 27,961,956      
Cost Capitalized Subsequent to Acquisition, Improvements 10,000,000      
Gross Amount Carried at Close of Period, Land 13,700,000      
Gross Amount Carried at Close of Period, Building & Fixtures 37,961,956      
Gross Amount Carried at Close of Period, Total 51,661,956      
Accumulated Depreciation 4,744,350      
Investment in Real Estate, net $ 46,917,606      
Life on which depreciation in latest income statement is computed 30 years      
United Property Systems [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company, Land 210,000      
Initial Cost to Company, Building & Fixtures 1,188,000      
Cost Capitalized Subsequent to Acquisition, Improvements 75,022      
Gross Amount Carried at Close of Period, Land 210,000      
Gross Amount Carried at Close of Period, Building & Fixtures 1,263,022      
Gross Amount Carried at Close of Period, Total 1,473,022      
Accumulated Depreciation 101,434      
Investment in Real Estate, net $ 1,371,588      
Life on which depreciation in latest income statement is computed 40 years      
Grand Isle Gathering System [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company, Land 960,000      
Initial Cost to Company, Building & Fixtures 258,471,397      
Cost Capitalized Subsequent to Acquisition, Improvements (5,058,280)      
Gross Amount Carried at Close of Period, Land 960,000      
Gross Amount Carried at Close of Period, Building & Fixtures 253,413,117      
Gross Amount Carried at Close of Period, Total 254,373,117      
Accumulated Depreciation 22,677,871      
Investment in Real Estate, net $ 231,695,246      
Life on which depreciation in latest income statement is computed 27 years