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Discontinued Operations (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 10, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Assets held for sale |  |  | $ 396,000 |  | $ 396,000 |  | $ 485,000
Storage costs |  |  | 0 |  | 68,000 |  |
Loss from discontinued operations |  |  | (9,000) | $ (74,000) | (19,000) | $ (99,000) |
Fuel Conversion Segment |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Severance costs |  |  | 30,000 |  | 0 |  |
Fuel Conversion Segment | Accrued Liabilities |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Accrued severance charges |  |  | $ 5,000 |  | 5,000 |  | 65,000
Sold | Fuel Conversion Segment |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Assets held for sale |  |  |  |  |  |  | $ 0
Held-for-sale | Fuel Conversion Segment |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Storage costs |  |  |  |  | $ 13 |  |
Scenario, Forecast | Fuel Conversion Segment |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Severance costs |  | $ 5,000 |  |  |  |  |
Subsequent Event | Held-for-sale | Fuel Conversion Segment |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Disposal consideration | $ 500,000 |  |  |  |  |  |
Commissions | $ 50 |  |  |  |  |  |

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