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Summary of Significant Accounting Policies - Narrative (Details) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2017 | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) subsidiaries reporting_unit segments | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of operating segments | segments |  |  |  |  |  | 2 |  |  |  |
Number of reportable segments | segments |  |  |  |  |  | 2 |  |  |  |
Goodwill impairment |  |  |  |  |  | $ 0 | $ 0 |  |  |
Deferred charges and intangible assets |  | $ 21,837,351 |  |  |  | 23,247,498 | 21,837,351 |  |  |
Accumulated amortization on deferred charges |  | 10,693,175 |  |  |  | 13,043,424 | 10,693,175 |  |  |
Amortization expense |  |  |  |  |  | 2,363,277 | 2,443,117 | $ 2,459,787 |  |
Shipping costs |  |  |  |  |  | 9,846,616 | 7,502,945 | 4,488,041 |  |
Research and development expense |  |  |  |  |  | 548,464 | 556,181 | 603,067 |  |
Increase in net loss from mark-to-market adjustment from loss on investments |  |  |  |  |  | 2,572,703 |  |  |  |
Valuation loss on investments reclassified out of other comprehensive income |  | 1,005,829 | $ (1,573,098) | $ 1,196,225 | $ 0 | 13,097,429 | $ 1,330,498 | $ (7,093,301) |  |
Accounting Standards Update 2016-01 |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative adjustment |  |  |  |  |  |  |  |  |  | $ 0
Increase in net loss from mark-to-market adjustment from loss on investments |  |  |  |  |  | $ 2,573,000 |  |  |  |
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative adjustment |  |  |  |  |  |  |  |  |  | 10,864
Accounting Standards Update 2016-01 | Retained Earnings |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative adjustment |  |  |  |  |  |  |  |  |  | (10,864)
Accounting Standards Update 2016-02 | Retained Earnings |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative adjustment |  |  |  |  |  |  |  |  |  | $ 6,000,000
Software Licenses |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  |  | 5 years |  |  |  |
Customer List |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average amortization period for intangible assets |  |  |  |  |  | 11 years |  |  |  |
Marcegalia USA, Inc. - Stainless | Customer List |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization period for intangible assets |  |  |  |  |  |  | 15 years |  |  |
Marcegalia USA, Inc. - Stainless | Earn-Out Payment |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration earn-out period | 4 years |  |  |  |  |  |  |  |  |
Obsolescence Reserve |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Inventory reserves |  | 411,157 |  |  |  | $ 316,903 | $ 411,157 |  |  |
Physical Inventory Shrink Reserve |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Inventory reserves |  | $ 285,627 |  |  |  | $ 359,505 | $ 285,627 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Accounts receivable, payment terms |  |  |  |  |  | 30 days |  |  |  |
Amortization period for intangible assets |  |  |  |  |  | 8 years |  |  |  |
Minimum | Accounting Standards Update 2016-02 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Right-of-use assets under operating leases |  |  |  |  |  |  |  |  | $ 32,000,000 |
Operating lease liabilities |  |  |  |  |  |  |  |  | 32,000,000 |
Minimum | Land Improvement and Buildings |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  |  | 10 years |  |  |  |
Minimum | Machinery, Fixtures and Equipment |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  |  | 3 years |  |  |  |
Minimum | Deferred Charges |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization period for intangible assets |  |  |  |  |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Accounts receivable, payment terms |  |  |  |  |  | 60 days |  |  |  |
Amortization period for intangible assets |  |  |  |  |  | 15 years |  |  |  |
Maximum | Accounting Standards Update 2016-02 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Right-of-use assets under operating leases |  |  |  |  |  |  |  |  | 36,000,000 |
Operating lease liabilities |  |  |  |  |  |  |  |  | $ 36,000,000 |
Maximum | Land Improvement and Buildings |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  |  | 40 years |  |  |  |
Maximum | Machinery, Fixtures and Equipment |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  |  | 20 years |  |  |  |
Maximum | Deferred Charges |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization period for intangible assets |  |  |  |  |  | 10 years |  |  |  |
Metals Segment |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  |  |  | 3 |  |  |  |
Number of subsidiaries | subsidiaries |  |  |  |  |  | 3 |  |  |  |
Metals Segment | Synalloy Metals, Inc. |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage of subsidiary |  |  |  |  |  | 100.00% |  |  |  |
Specialty Chemicals Segment |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  |  |  | 1 |  |  |  |
Number of subsidiaries | subsidiaries |  |  |  |  |  | 2 |  |  |  |
Specialty Chemicals Segment | Manufacturers Soap and Chemical Company |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage of subsidiary |  |  |  |  |  | 100.00% |  |  |  |

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