Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	$ (1,531,305)	$ (1,889,996)	$ (1,511,290)	$ (1,762,387)
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassifications	(1,046)	(9,370)	(23,909)	(140,169)
Amounts reclassified from accumulated other comprehensive (loss) income	567	3,231	3,415	6,421
Total other comprehensive loss, net of taxes:	(479)	(6,139)	(20,494)	(133,748)
Accumulated other comprehensive (loss) income, ending balance	(1,531,784)	(1,896,135)	(1,531,784)	(1,896,135)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	(1,562,996)	(1,820,191)	(1,536,495)	(1,693,905)
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassifications	(4,477)	(12,184)	(30,978)	(138,470)
Amounts reclassified from accumulated other comprehensive (loss) income	0	0	0	0
Total other comprehensive loss, net of taxes:	(4,477)	(12,184)	(30,978)	(138,470)
Accumulated other comprehensive (loss) income, ending balance	(1,567,473)	(1,832,375)	(1,567,473)	(1,832,375)
Net Unrealized Gains On Marketable Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	2,611	1,595	(1,408)	3,410
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassifications	1,792	2,433	4,619	618
Amounts reclassified from accumulated other comprehensive (loss) income	(1,135)	0	57	0
Total other comprehensive loss, net of taxes:	657	2,433	4,676	618
Accumulated other comprehensive (loss) income, ending balance	3,268	4,028	3,268	4,028
Net Minimum Pension Liability
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	29,080	(71,400)	26,613	(71,892)
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassifications	1,639	381	2,450	(2,317)
Amounts reclassified from accumulated other comprehensive (loss) income	1,702	3,231	3,358	6,421
Total other comprehensive loss, net of taxes:	3,341	3,612	5,808	4,104
Accumulated other comprehensive (loss) income, ending balance	$ 32,421	$ (67,788)	$ 32,421	$ (67,788)