Income Taxes - US Statutory Rate Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal income taxes at 21% statutory rate	$ 1,083,174	$ 2,322,741
State and local taxes, net of federal income tax effect	95,278	39,783
Permanent items	(75,022)	(370,978)
Transition tax on deemed repatriation of foreign earnings		1,169,263
Effect of federal rate change on deferred taxes	(111,324)	74,462
Foreign tax rate difference	(59,232)	(699,047)
Change in deferred income tax valuation allowance		(95,406)
Provision for income taxes	$ 932,874	$ 2,440,818