4. Revenue Recognition (Details 2) - USD ($)	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Sales to three major customers	$ 778,137	$ 634,445
Total percentage of revenue	62.09%	36.40%
Zeo, Inc.
Sales to three major customers	$ 152,317	$ 0
GE Chaplin, Inc.
Sales to three major customers	298,150	114,291
Nyacol Technologies
Sales to three major customers	0	106,161
Mexichem Speciality Compounds Inc.
Sales to three major customers	$ 327,670	$ 413,993

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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