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Debt (Narrative) (Details) $ in Millions |  |  | 12 Months Ended | 27 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 14, 2017 USD ($) | Jun. 29, 2016 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2019 | Jun. 28, 2016 | Jan. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility borrowing base |  | $ 20.0 |  |  |  |
Maximum borrowing capacity under loan agreement |  |  |  |  |  | $ 65.0
Debt service coverage ratio minimum at each quarter |  |  | 1.2 |  |  |
Maximum [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Ratio of net debt to EBITDAX |  |  |  | 3.0 |  |
Senior Tranche [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, commitment fee |  |  |  |  | 1.50% |
Maximum borrowing capacity under loan agreement |  | 50.0 |  |  |  |
Subordinated Tranche [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, commitment fee |  |  |  |  | 2.30% |
Maximum borrowing capacity under loan agreement |  | 15.0 |  |  |  |
Additional Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility borrowing base |  | 5.0 |  |  |  |
Borrowings | $ 4.2 |  |  |  |  |
Additional Term Loan [Member] | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate spread | 5.75% |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loans Payable |  | $ 15.0 | $ 9.2 |  |  |
Term Loan [Member] | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate spread |  | 5.75% |  |  |  |

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