Description Of Business And Significant Accounting Policies (Accounts Receivable) (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable - current	$ 608,000	$ 533,000
Allowance for doubtful accounts	0
Revenue [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable - current	474,000	396,000
Tax [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable - current	129,000	129,000
Accounts receivable - noncurrent	130,000	130,000
Joint Interest [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable - current	$ 5,000	$ 8,000