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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred income tax liabilities: |  |
Plant, property and equipment | $ 536,759 | $ 469,247
Total | 536,759 | 469,247
Deferred income tax assets: |  |
Asset valuations | 677,994 | 608,905
Operating loss carryforwards and credits | 110,110 | 138,090
Pension | 189,920 | 166,625
Foreign tax credit | 186,504 | 28,049
Other | 753,219 | 734,993
Total | 1,917,747 | 1,676,662
Net deferred income tax asset before valuation allowance | 1,380,988 | 1,207,415
Valuation allowance | (110,110) | (138,090)
Net deferred income tax asset | $ 1,270,878 | $ 1,069,325

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