Annual report pursuant to Section 13 and 15(d)

Leased Properties and Leases - Amortization, Depreciation Expense, Accretion Expense (Details)

v3.8.0.1
Leased Properties and Leases - Amortization, Depreciation Expense, Accretion Expense (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sale Leaseback Transaction [Line Items]      
Depreciation Expense $ 3,400,000 $ 3,400,000 $ 3,300,000
ARO Accretion Expense 663,065 726,664  
All Properties [Member]      
Sale Leaseback Transaction [Line Items]      
Depreciation Expense 19,935,994 18,350,454 15,021,948
Amortization Expense - Deferred Lease Costs 91,932 91,932 76,498
ARO Accretion Expense 663,065 726,664 339,042
Net Deferred Lease Costs 871,600 963,532  
GIGS [Member]      
Sale Leaseback Transaction [Line Items]      
Depreciation Expense 9,754,596 8,605,506 4,317,769
Amortization Expense - Deferred Lease Costs 30,564 30,564 15,130
ARO Accretion Expense 663,065 726,664 339,042
Net Deferred Lease Costs 259,883 290,447  
Pinedale [Member]      
Sale Leaseback Transaction [Line Items]      
Depreciation Expense 8,869,440 8,869,440 8,869,440
Amortization Expense - Deferred Lease Costs 61,368 61,368 61,368
Net Deferred Lease Costs 611,717 673,085  
Portland Terminal Facility [Member]      
Sale Leaseback Transaction [Line Items]      
Depreciation Expense 1,275,660 843,084 1,235,369
Eastern Interconnect Project [Member]      
Sale Leaseback Transaction [Line Items]      
Depreciation Expense 0 0 569,670
United Property Systems [Member]      
Sale Leaseback Transaction [Line Items]      
Depreciation Expense $ 36,298 $ 32,424 $ 29,700