Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other comprehensive income (loss)
Accumulated other comprehensive (loss) income, beginning balance	$ (11,553,796)
Total other comprehensive income (loss), net of applicable taxes:	19,392	$ (85,245)
Accumulated other comprehensive (loss) income, ending balance	(12,026,326)
Foreign Currency Translation
Other comprehensive income (loss)
Accumulated other comprehensive (loss) income, beginning balance	(1,921,905)	(1,980,940)
Other comprehensive income	19,392	(85,245)
Total other comprehensive income (loss), net of applicable taxes:	19,392	(85,245)
Accumulated other comprehensive (loss) income, ending balance	(1,902,513)	(2,066,185)
Net Minimum Pension Liability
Other comprehensive income (loss)
Accumulated other comprehensive (loss) income, beginning balance	26,803	22,097
Other comprehensive income	0	0
Total other comprehensive income (loss), net of applicable taxes:	0	0
Accumulated other comprehensive (loss) income, ending balance	26,803	22,097
Accumulated Other Comprehensive loss, net
Other comprehensive income (loss)
Accumulated other comprehensive (loss) income, beginning balance	(1,895,102)	(1,958,843)
Other comprehensive income	19,392	(85,245)
Total other comprehensive income (loss), net of applicable taxes:	19,392	(85,245)
Accumulated other comprehensive (loss) income, ending balance	$ (1,875,710)	$ (2,044,088)