Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	$ (1,531,784)	$ (1,896,135)	$ (1,511,290)	$ (1,762,387)
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassifications	(98,882)	175,972	(122,385)	35,803
Amounts reclassified from accumulated other comprehensive (loss) income	1,533	3,232	4,542	9,653
Total other comprehensive loss, net of taxes:	(97,349)	179,204	(117,843)	45,456
Accumulated other comprehensive (loss) income, ending balance	(1,629,133)	(1,716,931)	(1,629,133)	(1,716,931)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	(1,567,473)	(1,832,375)	(1,536,495)	(1,693,905)
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassifications	(93,045)	183,858	(124,023)	45,388
Amounts reclassified from accumulated other comprehensive (loss) income	0	0	0	0
Total other comprehensive loss, net of taxes:	(93,045)	183,858	(124,023)	45,388
Accumulated other comprehensive (loss) income, ending balance	(1,660,518)	(1,648,517)	(1,660,518)	(1,648,517)
Net Unrealized Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	3,268	4,028	(1,408)	3,410
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassifications	1,511	(3,900)	6,536	(3,282)
Amounts reclassified from accumulated other comprehensive (loss) income	(82)	0	(431)	0
Total other comprehensive loss, net of taxes:	1,429	(3,900)	6,105	(3,282)
Accumulated other comprehensive (loss) income, ending balance	4,697	128	4,697	128
Net Minimum Pension Liability
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	32,421	(67,788)	26,613	(71,892)
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassifications	(7,348)	(3,986)	(4,898)	(6,303)
Amounts reclassified from accumulated other comprehensive (loss) income	1,615	3,232	4,973	9,653
Total other comprehensive loss, net of taxes:	(5,733)	(754)	75	3,350
Accumulated other comprehensive (loss) income, ending balance	$ 26,688	$ (68,542)	$ 26,688	$ (68,542)