Comprehensive Income - Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accumulated other comprehensive income, beginning balance	$ (2,530,790)	$ 1,647,098
Change in net prior service credit and actuarial losses, net of tax	284,145	(52,825)
Translation adjustment	(89,556)	(830,867)
Accumulated other comprehensive income, ending balance	(2,336,201)	(2,530,790)
Foreign Currency Translation Adjustment
Accumulated other comprehensive income, beginning balance	(1,582,632)	(751,765)
Translation adjustment	(89,556)	(830,867)
Accumulated other comprehensive income, ending balance	(1,672,188)	(1,582,632)
Net Prior Service Credit and Actuarial Losses
Accumulated other comprehensive income, beginning balance	(948,157)	(895,332)
Change in net prior service credit and actuarial losses, net of tax	284,145	(52,825)
Accumulated other comprehensive income, ending balance	$ (664,012)	$ (948,157)