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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2012 | Dec. 31, 2018
Proceeds from sale of common stock |  |  | $ 22,500,000 |
Valuation allowance against net deferred tax asset | $ 0 |  |  |
Net operating loss carry forwards | 22,742,000 |  |  |
Carryforwards utilize limit before the stock offering closed | 163,000 |  |  |
Unutilized operating loss carryforwards that will expire | 20,520,000 |  |  |
Reduced deferred tax assets and valuation allowance | 6,977,000 |  |  |
Additional bad debt deductions (expense) | 2,250,000 |  |  |
Deferred tax liability not recorded | 473,000 |  |  |
Deferred tax asset | 1,600,000 |  |  | $ 1,600,000
Unrecognized Tax Benefits | $ 0 |  |  | $ 0
Effective tax rate | 20.00% | 19.10% |  |
Minimum [Member] |  |  |  |
Operating loss carryforwards, expiration | Dec. 31, 2024 |  |  |
Maximum [Member] |  |  |  |
Operating loss carryforwards, expiration | Dec. 31, 2033 |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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