Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements Of Comprehensive Income
Net income	$ 5,850,998	$ 4,793,525
Other comprehensive (loss) gain -
Foreign currency translation	(89,556)	(830,867)
Change in net prior service credit and actuarial gains (losses), net of income tax expense	284,145	(52,825)
Total other comprehensive gain (loss)	194,589	(883,692)
Comprehensive income	$ 6,045,587	$ 3,909,833