3. REVENUE RECOGNITION (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
REVENUE	$ 1,779,848	$ 2,324,727	$ 5,327,648	$ 7,759,221
Deferred revenue and customer deposit	$ 576,954		576,954		$ 841,290
Reimbursable Costs
REVENUE			$ 2,607,297	$ 4,518,054