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Summary of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) subsidiaries segments | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Accounting Policies [Line Items] |  |  |
Number of operating segments (segments) | segments | 2 |  |
Goodwill impairment | $ 0 | $ 0 | $ 17,158,249
Deferred charges and intangible assets | 21,837,351 | 20,708,496 |
Accumulated amortization on deferred charges | 10,693,175 | 8,253,040 |
Shipping costs | 7,502,945 | 4,488,041 | 5,155,011
Research and development expense | 556,181 | 603,067 | 548,257
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 2,380,950 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 2,246,816 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 2,073,384 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 1,899,298 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 1,677,948 |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | 865,780 |  |
Amortization expense | 2,443,117 | 2,459,787 | 2,277,480
Inventory Valuation Reserve [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Charged to (Reduction of) Cost and Expenses | 1,237,000 | 984,000 | 767,000
Valuation Allowances and Reserves, Deductions | 1,506,000 | 700,000 | 810,000
Allowance for Doubtful Accounts [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Charged to (Reduction of) Cost and Expenses | 202,000 | (45,000) | 104,000
Valuation Allowances and Reserves, Deductions | $ 249,000 | 120,000 | 972,000
Minimum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Accounts receivable, payment terms (days) | 30 days |  |
Intangible asset depreciation period (years) | 8 years |  |
Maximum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Accounts receivable, payment terms (days) | 60 days |  |
Intangible asset depreciation period (years) | 15 years |  |
Land improvements and buildings [Member] | Minimum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Depreciation useful life (years) | 10 years |  |
Land improvements and buildings [Member] | Maximum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Depreciation useful life (years) | 40 years |  |
Machinery, fixtures and equipment [Member] | Minimum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Depreciation useful life (years) | 3 years |  |
Machinery, fixtures and equipment [Member] | Maximum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Depreciation useful life (years) | 20 years |  |
Software licenses [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Depreciation useful life (years) | 5 years |  |
Metals Segment [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Number of subsidiaries (subsidiaries) | subsidiaries | 3 |  |
Goodwill impairment | $ 0 | 0 | $ 17,158,249
Specialty Chemicals Segment [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Number of operating segments (segments) | segments | 1 |  |
Number of subsidiaries (subsidiaries) | subsidiaries | 2 |  |
Bristol Metals, LLC, Palmer of Texas Tanks, Inc., and Specialty Pipe & Tube [Member] | Metals Segment [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Ownership percentage of subsidiary (percent) | 100.00% |  |
Manufacturers Soap and Chemical Company [Member] | Specialty Chemicals Segment [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Ownership percentage of subsidiary (percent) | 100.00% |  |
Deferred Charges [Member] | Minimum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Intangible asset depreciation period (years) | 3 years |  |
Deferred Charges [Member] | Maximum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Intangible asset depreciation period (years) | 10 years |  |
Customer Relationships [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Weighted average amortization period (years) | 11 years |  |
Obsolescence reserve [Member] | Inventory Valuation Reserve [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Inventory reserves | $ 411,157 | 697,000 |
Physical inventory shrink reserve [Member] | Inventory Valuation Reserve [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Inventory reserves | $ 285,627 | $ 268,579 |

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