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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2012
Income Taxes [Abstract] |  |  |  |  |  |  |
Proceeds from sale of common stock |  |  |  |  |  |  | $ 22,500,000
Net operating loss carry forwards |  | $ 23,059,000 |  |  |  | $ 23,059,000 |
Carryforwards utilize limit before the stock offering closed |  |  |  |  |  | 163,000 |
Unutilized operating loss carryforwards that will expire |  | 20,520,000 |  |  |  | 20,520,000 |
Reduced deferred tax assets and valuation allowance |  | 6,977,000 |  |  |  | 6,977,000 |
Statutory income tax rate | 21.00% |  | 34.00% | 21.00% | 34.00% |  |
Additional bad debt deductions (expense) |  |  |  |  |  | 2,250,000 |
Impact of new taxes on bad debt expense |  | 979,000 |  |  |  |  |
Deferred tax liability not recorded |  | 473,000 |  |  |  | 473,000 |
Deferred tax asset | $ 1,600,000 | 1,600,000 |  | $ 1,600,000 |  | 1,600,000 |
Unrecognized Tax Benefits | $ 0 | $ 0 |  | $ 0 |  | $ 0 |
Effective tax rate | 18.40% |  | 32.60% | 19.10% | 33.00% |  |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deductions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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