Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other comprehensive (loss) income
Accumulated other comprehensive (loss) income, beginning balance	$ (21,702,577)
Total other comprehensive loss, net of applicable taxes:	(185,529)	$ (220,200)
Accumulated other comprehensive (loss) income, ending balance	(22,768,772)
Foreign Currency Translation
Other comprehensive (loss) income
Accumulated other comprehensive (loss) income, beginning balance	(1,866,388)	(1,726,994)
Other comprehensive (loss) income before reclassifications	(185,529)	(227,415)
Amounts reclassified from accumulated other comprehensive (loss) income	0	0
Total other comprehensive loss, net of applicable taxes:	(185,529)	(227,415)
Accumulated other comprehensive (loss) income, ending balance	(2,051,917)	(1,954,409)
Net Unrealized Gains (Losses) on Marketable Securities
Other comprehensive (loss) income
Accumulated other comprehensive (loss) income, beginning balance	0	(3,406)
Other comprehensive (loss) income before reclassifications	0	4,467
Amounts reclassified from accumulated other comprehensive (loss) income	0	(428)
Total other comprehensive loss, net of applicable taxes:	0	4,039
Accumulated other comprehensive (loss) income, ending balance	0	633
Net Minimum Pension Liability
Other comprehensive (loss) income
Accumulated other comprehensive (loss) income, beginning balance	28,675	27,186
Other comprehensive (loss) income before reclassifications	0	1,973
Amounts reclassified from accumulated other comprehensive (loss) income	0	1,203
Total other comprehensive loss, net of applicable taxes:	0	3,176
Accumulated other comprehensive (loss) income, ending balance	28,675	30,362
Accumulated Other Comprehensive loss, net
Other comprehensive (loss) income
Accumulated other comprehensive (loss) income, beginning balance	(1,837,713)	(1,703,214)
Other comprehensive (loss) income before reclassifications	(185,529)	(220,975)
Amounts reclassified from accumulated other comprehensive (loss) income	0	775
Total other comprehensive loss, net of applicable taxes:	(185,529)	(220,200)
Accumulated other comprehensive (loss) income, ending balance	$ (2,023,242)	$ (1,923,414)