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Other Income, Net (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other income, net
Interest income	$ 388,801	$ 238,106	$ 122,575
Realized gain (losses) on maturities of investments	10,764	(29,308)	(6,761)
Foreign currency exchange losses	(3,653)	(15,261)	(4,437)
Total other income, net	$ 395,912	$ 193,537	$ 111,377

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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