Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Condensed Consolidated Statements Of Comprehensive Loss Income [Abstract]
Net income	$ 8,098,766	$ 5,513,608
Other comprehensive gain
Foreign currency translation	647,632	45,223
Change in net prior service credit and actuarial gains, net of income tax expense	514,271	143,906
Total other comprehensive income (loss)	1,161,903	189,129
Comprehensive income	$ 9,260,669	$ 5,702,737