Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Deferred income tax liabilities:
Plant, property and equipment	$ 847,162	$ 563,289
Total	847,162	563,289
Deferred income tax assets:
Asset valuations	575,920	506,993
Pension	105,647	96,098
Other	278,948	469,844
Total	960,515	1,072,935
Net deferred income tax asset	$ 113,353	$ 509,646