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Description Of Business And Significant Accounting Policies (Narrative) (FY) (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Customer
Dec. 31, 2018
USD ($)
Description Of Business And Significant Accounting Policies [Line Items]            
Unevaluated properties $ 0   $ 0   $ 0 $ 0
Current cost discount         10.00%  
Stock based compensation     7,000 $ 10,000 $ 17,000 23,000
Federal net operating loss carryforwards         33,800,000  
Deferred tax asset 0   0   65,000 130,000
Derivatives         $ 0 0
Customers | Customer         2  
Impairment     0 0 $ 0 0
Accounts receivable - noncurrent     65,000 130,000
Gain on sale of assets     3,000 44,000 45,000 33,000
Inventory 293,000   293,000   415,000 464,000
Allowance for doubtful accounts 0   0   0 0
Revenue $ 563,000 $ 1,390,000 1,526,000 $ 2,562,000 4,911,000 5,871,000
Natural Gas Imbalances [Member]            
Description Of Business And Significant Accounting Policies [Line Items]            
Revenue     $ 0   $ 0 $ 0
Customer A [Member] | Revenue [Member]            
Description Of Business And Significant Accounting Policies [Line Items]            
Customer's percentage of risk         87.70% 85.60%
Customer B [Member] | Revenue [Member]            
Description Of Business And Significant Accounting Policies [Line Items]            
Customer's percentage of risk         11.80% 13.80%
Customer C [Member] | Accounts Receivable [Member]            
Description Of Business And Significant Accounting Policies [Line Items]            
Customer's percentage of risk         76.90% 84.40%
Two Customers [Member] | Accounts Receivable [Member]            
Description Of Business And Significant Accounting Policies [Line Items]            
Customer's percentage of risk         86.00% 93.20%
Equipment [Member]            
Description Of Business And Significant Accounting Policies [Line Items]            
Gain on sale of assets         $ 45,000  
Proceeds from sale of equipment inventory         $ 150,000