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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Railcars Available for Lease, Useful Life |  | 40 years |  |
Research and Development Expense |  | $ 298 | $ 386 | $ 379
Goodwill, Impairment Loss |  | $ 0 | $ 0 | $ 0
Income tax rate |  | 35.00% | 35.00% | 35.00%
Scenario, Plan [Member] |  |  |  |
Income tax rate | 21.00% |  |  |
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member] |  |  |  |
Cumulative effect |  | $ 215 |  |
Accounting Standards Update 2016-09 [Member] | Additional Paid In Capital [Member] |  |  |  |
Cumulative effect |  | $ 215 |  |
Maximum [Member] |  |  |  |
Warranty period |  | 5 years |  |
Useful life of assets related to state and local incentives |  | 16 years |  |
Minimum [Member] |  |  |  |
Useful life of assets related to state and local incentives |  | 7 years |  |
Income Approach Valuation Technique [Member] |  |  |  |
Valuation weighting |  | 60.00% |  |
Market Approach Valuation Technique [Member] |  |  |  |
Valuation weighting |  | 40.00% |  |

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