Description Of Business And Significant Accounting Policies (Narrative) (Details)			12 Months Ended
	Feb. 25, 2021	Mar. 21, 2016	Dec. 31, 2020 USD ($) customer	Dec. 31, 2019 USD ($)
Description Of Business And Significant Accounting Policies [Line Items]
Unevaluated properties			$ 0	$ 0
Current cost discount			10.00%
Stock based compensation			$ 14,000	17,000
Deferred tax asset				65,000
Derivatives			$ 0	0
Customers | customer			2
Impairment			$ 920,000	0
Accounts receivable - noncurrent				65,000
Allowance for doubtful accounts			$ 0	$ 0
Reverse stock split		0.1
Customer A [Member] | Revenue [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Customer's percentage of revenue			84.70%	87.70%
Customer B [Member] | Revenue [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Customer's percentage of revenue			11.10%	11.80%
Customer C [Member] | Accounts Receivable [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Customer's percentage of revenue			83.90%	76.90%
Two Customers [Member] | Accounts Receivable [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Customer's percentage of revenue			96.80%	86.00%
Subsequent Event [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Reverse stock split	0.083