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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Deferred income tax liabilities: |  |
Plant, property and equipment | $ 563,289 | $ 604,271
Total | 563,289 | 604,271
Deferred income tax assets: |  |
Asset valuations | 506,993 | 720,189
Operating loss carryforwards and credits | 95,406 | 121,658
Pension | 96,098 | 227,681
Foreign tax credit |  | 186,504
Other | 469,844 | 593,140
Total | 977,529 | 1,849,172
Net deferred income tax asset before valuation allowance | 414,240 | 1,244,901
Valuation allowance | 95,406 | 74,552
Net deferred income tax asset | $ 509,646 | $ 1,170,349

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