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Long-term Debt - Narrative (Details) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) | Dec. 20, 2018 USD ($) debt_installment | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 19, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Repayments of debt, number of consecutive installments | debt_installment |  | 60 |  |  |  |  |
Asset impairments |  |  | $ 6,079,000 | $ 0 | $ 6,079,000 | $ 0 |
$20 million Term loan, due January 1, 2024 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt term | 5 years | 5 years |  |  |  |  |
Principal amount of debt | $ 20,000,000 | $ 20,000,000 |  |  |  |  |
$20 million Term loan, due January 1, 2024 | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread |  | 1.90% |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Minimum fixed charge coverage ratio |  |  |  |  | 1.25 |  |
Covenants, minimum tangible net worth |  |  | 60,000,000.0 |  | $ 60,000,000.0 |  |
Minimum fixed charge coverage ratio actual |  |  |  |  | 1.39 |  |
Covenants, minimum tangible net worth actual |  |  | 67,400,000 |  | $ 67,400,000 |  |
Revolving Credit Facility | $100 million Revolving line of credit, due December 20, 2021 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 100,000,000 |  |  |  |  | $ 80,000,000
Remaining borrowing capacity |  |  | 7,200,000 |  | 7,200,000 |  |
Revolving Credit Facility | $100 million Revolving line of credit, due December 20, 2021 | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread |  | 1.65% |  |  |  |  |
Palmer of Texas |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Asset impairments |  |  | $ 6,100,000 |  | $ 6,000,000.0 |  |

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