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