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Environmental Compliance Costs (Details) | Dec. 31, 2017 USD ($) solid_waste_management_units | Dec. 31, 2016 USD ($)
--- | --- | ---
Environmental Exit Cost [Line Items] |  |
Environmental remediation reserves | $ 549,000 | $ 589,887
Augusta Plant [Member] |  |
Environmental Exit Cost [Line Items] |  |
Environmental remediation reserves | 474,000 | 514,887
Bristol, Tennessee Facility [Member] |  |
Environmental Exit Cost [Line Items] |  |
Environmental remediation reserves | $ 75,000 | $ 75,000
Number of solid waste management units | solid_waste_management_units | 2 |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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