Accumulated Other Comprehensive Loss (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	$ (1,511,290)	$ (1,762,387)	$ (1,650,050)
Other comprehensive (loss) income
Other comprehensive income (loss) before reclassifications	(198,045)	242,310	(120,061)
Amounts reclassified from accumulated other comprehensive income (loss)	6,121	8,787	7,724
Total other comprehensive income (loss)	(191,924)	251,097	(112,337)
Accumulated other comprehensive (loss) income, ending balance	(1,703,214)	(1,511,290)	(1,762,387)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	(1,536,495)	(1,693,905)	(1,601,138)
Other comprehensive (loss) income
Other comprehensive income (loss) before reclassifications	(190,499)	157,410	(92,767)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Total other comprehensive income (loss)	(190,499)	157,410	(92,767)
Accumulated other comprehensive (loss) income, ending balance	(1,726,994)	(1,536,495)	(1,693,905)
Net Unrealized Gains (Losses) On Marketable Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	(1,408)	3,410	6,210
Other comprehensive (loss) income
Other comprehensive income (loss) before reclassifications	(1,549)	(844)	(1,974)
Amounts reclassified from accumulated other comprehensive income (loss)	(449)	(3,974)	(826)
Total other comprehensive income (loss)	(1,998)	(4,818)	(2,800)
Accumulated other comprehensive (loss) income, ending balance	(3,406)	(1,408)	3,410
Net Minimum Pension Liability
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	26,613	(71,892)	(55,122)
Other comprehensive (loss) income
Other comprehensive income (loss) before reclassifications	(5,997)	85,744	(25,320)
Amounts reclassified from accumulated other comprehensive income (loss)	6,570	12,761	8,550
Total other comprehensive income (loss)	573	98,505	(16,770)
Accumulated other comprehensive (loss) income, ending balance	$ 27,186	$ 26,613	$ (71,892)