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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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Income benefit attributable to accounting method changes on tax return.

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Represents income tax benefit attributable to the pension contribution.

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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.

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Represents the Income taxes as a percentage of earnings before income taxes.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves, classified as other.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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