SUPPLEMENTAL OIL AND GAS DISCLOSURES (Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities) (Details) bbl in Thousands, Mcf in Thousands, MBoe in Thousands	12 Months Ended
	Dec. 31, 2021 MBoe bbl Mcf	Dec. 31, 2020 MBoe bbl Mcf
Proved developed and undeveloped reserves:
Beginning of year (MBoe) | MBoe	47,541	71,924
Revision of previous estimate (MBoe) | MBoe	28,685	(12,870)
Extension and discovery (MBoe) | MBoe	471	39
Infill reserves in existing proved fields (MBoe) | MBoe	1,366	238
Purchase of mineral in place (MBoe) | MBoe	0	112
Production (MBoe) | MBoe	(9,074)	(11,891)
Sales (MBoe) | MBoe	(1,672)	(11)
End of year (MBoe) | MBoe	67,317	47,541
Proved developed reserves:
Beginning of year (MBoe) | MBoe	47,541
End of year (MBoe) | MBoe	67,317	47,541
Proved undeveloped reserves
Beginning of year (MBoe) | MBoe	0
End of year (MBoe) | MBoe	0	0
Oil (bbls)
Proved developed and undeveloped reserves:
Beginning of year	8,267	12,196
Revision of previous estimates	2,651	(1,909)
Extensions and discoveries	218	8
Infill reserves in existing proved fields	713	97
Purchases of minerals in place	0	62
Production	(1,615)	(2,186)
Sales	(1,215)	(1)
End of year	9,019	8,267
Proved developed reserves:
Beginning of year	8,267
End of year	9,019	8,267
Proved undeveloped reserves
Beginning of year	0
End of year	0	0
Natural Gas Liquids (bbls)
Proved developed and undeveloped reserves:
Beginning of year	15,208	23,030
Revision of previous estimates	8,723	(4,477)
Extensions and discoveries	93	13
Infill reserves in existing proved fields	293	66
Purchases of minerals in place	0	20
Production	(2,624)	(3,444)
Sales	(169)	0
End of year	21,525	15,208
Proved developed reserves:
Beginning of year	15,208
End of year	21,525	15,208
Proved undeveloped reserves
Beginning of year	0
End of year	0	0
Natural gas (Mcf)
Proved developed and undeveloped reserves:
Beginning of year | Mcf	144,391	220,187
Revision of previous estimates | Mcf	103,866	(38,901)
Extensions and discoveries | Mcf	961	110
Infill reserves in existing proved fields | Mcf	2,158	452
Purchases of minerals in place | Mcf	0	172
Production | Mcf	(29,012)	(37,567)
Sales | Mcf	(1,725)	(62)
End of year | Mcf	220,640	144,391
Proved developed reserves:
Beginning of year | Mcf	144,391
End of year | Mcf	220,640	144,391
Proved undeveloped reserves
Beginning of year | Mcf	0
End of year | Mcf	0	0