Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Condensed Consolidated Statements Of Comprehensive Loss Income [Abstract]
Net income	$ 5,513,608	$ 4,598,350
Other comprehensive gain (loss) -
Foreign currency translation	45,223	(461,374)
Change in net prior service credit and actuarial gains, net of income tax expense	143,906	37,388
Total other comprehensive income (loss)	189,129	(423,986)
Comprehensive income	$ 5,702,737	$ 4,174,364