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Description Of Business And Significant Accounting Policies (Accounts Receivable) (Details) - USD ($)
Jun. 30, 2020
Mar. 27, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable - current $ 422,000   $ 557,000
Revenue [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable - current 267,000   415,000
Tax [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable - current 130,000 $ 65,000 65,000
Accounts receivable - noncurrent 0   65,000
Joint Interest [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable - current $ 25,000   $ 77,000