Schedule Of Segment Reporting (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Operating revenue	$ 101	$ 101	$ 98
Depreciation, depletion and amortization	13	12	18
Impairment of oil and gas properties			2,285
Total Operating Expenses	437	468	479
Interest expense	(5)	(12)	(15)
Other income (expense), net	191	85	199
Segment operating income (loss)	70	(52)	60
Current Operations [Member]
Segment Reporting Information [Line Items]
Operating revenue	101	101	98
Operating expenses	65	60	50
Depreciation, depletion and amortization	12	12	11
Impairment of oil and gas properties
Total Operating Expenses	77	72	61
Interest income
Interest expense
Gain in sale of oil & gas operations
Other income (expense), net
Segment operating income (loss)	24	29	37
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Operating revenue
Operating expenses	360	390	412
Depreciation, depletion and amortization		6	6
Impairment of oil and gas properties
Total Operating Expenses	360	396	418
Interest income	220	242	257
Interest expense	(5)	(12)	(15)
Gain in sale of oil & gas operations
Other income (expense), net	191	85	199
Segment operating income (loss)	46	(81)	23
Total Operations [Member]
Segment Reporting Information [Line Items]
Operating revenue	101	101	98
Operating expenses	425	450	462
Depreciation, depletion and amortization	12	18	17
Impairment of oil and gas properties
Total Operating Expenses	437	468	479
Interest income	220	242	257
Interest expense	(5)	(12)	(15)
Gain in sale of oil & gas operations
Other income (expense), net	191	85	199
Segment operating income (loss)	70	(52)	60
Oil And Gas Operations [Member]
Segment Reporting Information [Line Items]
Operating revenue		225	492
Operating expenses		395	550
Depreciation, depletion and amortization			69
Impairment of oil and gas properties			2,285
Total Operating Expenses		395	2,904
Interest income
Interest expense		2,138
Gain in sale of oil & gas operations
Other income (expense), net
Segment operating income (loss)		$ 1,968	$ (2,412)