Summary of Significant Accounting Policies (Summary of Geographic Information Relating to Sources, by Nation, of Partnership's Total Revenue and Long-Lived Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 2,818	$ 2,848
Long-lived assets	3,792	4,884
Operating Revenues [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 2,818	$ 2,848
Percentage of total	100.00%	100.00%
Long-lived Assets [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 3,792	$ 4,884
Percentage of total	100.00%	100.00%
United States [Member] \| Operating Revenues [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 2,774	$ 2,773
Percentage of total	98.00%	97.00%
United States [Member] \| Long-lived Assets [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 3,701	$ 4,793
Percentage of total	98.00%	98.00%
Canada [Member] \| Operating Revenues [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 44	$ 75
Percentage of total	2.00%	3.00%
Canada [Member] \| Long-lived Assets [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 91	$ 91
Percentage of total	2.00%	2.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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