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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 33,944,000      
Initial cost to company, land 106,655,063      
Initial cost to company, building & fixtures 384,778,459      
Costs capitalized subsequent to acquisition, improvements (6,396,307)      
Gross amount carried at close of period, land 106,655,063      
Gross amount carried at close of period, building & fixtures 378,382,152      
Gross amount carried at close of period, total 485,037,215 $ 485,368,450 $ 538,112,220 $ 541,478,086
Accumulated Depreciation 105,825,816 $ 87,154,095 $ 72,155,753 $ 52,219,717
Investment in Real Estate, net, at 12/31/19 379,211,399      
Pinedale LGS        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 33,944,000      
Initial cost to company, land 105,485,063      
Initial cost to company, building & fixtures 125,119,062      
Costs 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 62,370,978      
Investment in Real Estate, net, at 12/31/19 $ 168,233,147      
Life on which depreciation in latest income statement is computed 26 years      
United Property Systems        
SEC Schedule, 12-28, Real Estate Companies, Investment in 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      
Costs capitalized subsequent to acquisition, improvements 103,497      
Gross amount carried at close of period, land 210,000      
Gross amount carried at close of period, building & fixtures 1,291,497      
Gross amount carried at close of period, total 1,501,497      
Accumulated Depreciation 177,214      
Investment in Real Estate, net, at 12/31/19 $ 1,324,283      
Life on which depreciation in latest income statement is computed 40 years      
Grand Isle Gathering System        
SEC Schedule, 12-28, Real Estate Companies, Investment in 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      
Costs capitalized subsequent to acquisition, improvements (6,499,804)      
Gross amount carried at close of period, land 960,000      
Gross amount carried at close of period, building & fixtures 251,971,593      
Gross amount carried at close of period, total 252,931,593      
Accumulated Depreciation 43,277,624      
Investment in Real Estate, net, at 12/31/19 $ 209,653,969      
Life on which depreciation in latest income statement is computed 27 years