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Income Taxes (Detail Textuals) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Taxes [Line Items] |  |  |  |  |
Tax rate as percentage of earnings before income taxes | 12.60% |  | 32.40% | 11.80% | 33.60%
Valuation allowance against certain capital loss carryforward |  | $ 46,000 |  |  |
Income tax benefit attributable to the pension contribution |  | $ 306,000 |  |  |
Income benefit attributable to accounting method changes on tax return | $ 180,000 |  |  |  |
Tax Year 2017 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Federal corporate income tax rate |  |  |  | 34.00% |
Tax Year 2018 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Federal corporate income tax rate |  |  |  | 21.00% |

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- Definition Represents income tax benefit attributable to the pension contribution. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Represents the Income taxes as a percentage of earnings before income taxes. + References No definition available. + Details
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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28680-109314 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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