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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
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Deferred income tax liabilities: |  |
Plant, property and equipment | $ 604,271 | $ 536,759
Total | 604,271 | 536,759
Deferred income tax assets: |  |
Asset valuations | 720,189 | 677,994
Operating loss carryforwards and credits | 121,658 | 110,110
Pension | 227,681 | 189,920
Foreign tax credit | 186,504 | 186,504
Other | 593,140 | 753,219
Total | 1,849,172 | 1,917,747
Net deferred income tax asset before valuation allowance | 1,244,901 | 1,380,988
Valuation allowance | (74,552) | (110,110)
Net deferred income tax asset | $ 1,170,349 | $ 1,270,878

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