Organization and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Organization and Summary of Significant Accounting Policies [Abstract]
Maximum cash balance federally insured per financial institution	$ 250		$ 250
Workover expense		$ (26)	(71)	$ 366
Value of capital expenditures for oil and gas properties owed to operators	$ 100		100		$ 200
Depletion	$ 400		$ 400
Percentage of cash from operations allocated to shareholders	85.00%		85.00%
Percentage of cash from operations allocated to fund manager	15.00%		15.00%
Percentage of available cash from dispositions allocated to shareholders	99.00%		99.00%
Percentage of available cash from dispositions allocated to fund manager	1.00%		1.00%
Percentage of available cash from dispositions allocated to shareholders after distributions have equaled capital contributions	85.00%		85.00%
Percentage of available cash from dispositions allocated to fund manager after distributions have equaled capital contributions	15.00%		15.00%