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, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 89,600,577      
Initial Cost to Company, Land 120,355,063      
Initial Cost to Company, Building & Fixtures 412,740,415      
Cost Capitalized Subsequent to Acquisition, Improvements 8,382,608      
Gross Amount Carried at Close of Period, Land 120,355,063      
Gross Amount Carried at Close of Period, Building & Fixtures 421,123,023      
Gross Amount Carried at Close of Period, Total 541,478,086 $ 543,095,478 $ 293,823,903 $ 244,975,206
Accumulated Depreciation 52,219,717 $ 33,869,263 $ 25,295,958 $ 12,754,588
Investment in Real Estate, net 489,258,369      
Pinedale Liquids Gathering System [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 8,860,577      
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 35,762,658      
Investment in Real Estate, net $ 194,841,467      
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 $ 13,417,612      
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 3,468,690      
Investment in Real Estate, net $ 48,193,266      
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 $ 380,066      
Initial Cost to Company, Land 210,000      
Initial Cost to Company, Building & Fixtures 1,188,000      
Cost Capitalized Subsequent to Acquisition, Improvements 65,371      
Gross Amount Carried at Close of Period, Land 210,000      
Gross Amount Carried at Close of Period, Building & Fixtures 1,253,371      
Gross Amount Carried at Close of Period, Total 1,463,371      
Accumulated Depreciation 65,094      
Investment in Real Estate, net $ 1,398,277      
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 $ 66,942,322      
Initial Cost to Company, Land 960,000      
Initial Cost to Company, Building & Fixtures 258,471,397      
Cost Capitalized Subsequent to Acquisition, Improvements (1,682,763)      
Gross Amount Carried at Close of Period, Land 960,000      
Gross Amount Carried at Close of Period, Building & Fixtures 256,788,634      
Gross Amount Carried at Close of Period, Total 257,748,634      
Accumulated Depreciation 12,923,275      
Investment in Real Estate, net $ 244,825,359      
Life on which depreciation in latest income statement is computed 30 years