Organization and Summary of Significant Accounting Policies (Oil and Gas, Average Sale Price and Production Cost) (Details)	12 Months Ended
	Dec. 31, 2023 $ / MMBTU	Dec. 31, 2023 $ / barrel	Dec. 31, 2023 $ / bbl	Dec. 31, 2022 $ / MMBTU	Dec. 31, 2022 $ / barrel	Dec. 31, 2022 $ / bbl	Dec. 31, 2021 $ / MMBTU	Dec. 31, 2021 $ / barrel	Dec. 31, 2021 $ / bbl
Natural Gas
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Average sales price (in dollars per unit)	2.64			6.36			3.60
Oil
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Average sales price (in dollars per unit)		78.22	78.22		93.67	93.67		66.56	66.56
NGL
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Average sales price (in dollars per unit)		21.38	21.38		34.35	34.35		28.65	28.65