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Related Party Transactions (Narrative) (FY) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended | 106 Months Ended
--- | --- | --- | --- | ---
Dec. 18, 2007 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 26, 2018
Related Party Transaction [Line Items] |  |  |  |  |
Working interest percent | 15.00% |  |  |  |
Other income |  |  | $ 159,000 |  |
Payments to acquire interest in the drilling program wells |  | $ 134,690 |  |  |
Methane Project [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Percent of net profits, interest |  |  |  | 7.50% |
Hoactzin Partners, L.P. [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related parties accounts payable |  |  |  | $ 159,000 |
Past due related parties accounts payable |  |  |  | 159,000 |
Accounts receivable-related party, allowance for doubtful accounts |  |  |  | $ 159,000 |
Hoactzin Partners, L.P. [Member] | Methane Project [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Net profits |  |  |  |  | $ 0

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