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Revenue (Details Narrative)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sales Revenue, Net [Member]        
Partnership total revenue, percentage 99.00% 99.00% 99.00% 99.00%
Other Revenues [Member]        
Partnership total revenue, percentage 1.00% 1.00% 1.00% 1.00%