3. Revenue Recognition (Details 1) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 8,646,020	$ 9,203,334
Contract liabilities - current	110,218	0
Contract liabilities - non-current	$ 154,679	$ 0

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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