13. Stockholders' Equity (Details - Warrant activity) - Stock Purchase Warrants [Member] - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of warrants
Warrants outstanding, beginning balance	781,910	1,038,365	7,608,154
Warrants issued	4,950,000	0	567,166
Warrants exercised	0	(256,455)	(7,107,765)
Warrants forfeited	0		(29,190)
Warrants outstanding, ending balance	5,731,910	781,910	1,038,365
Weighted Average Exercise Price
Weighted Average Exercise Price, Warrants outstanding, beginning balance	$ 1.36	$ 1.36	$ 0.26
Weighted Average Exercise Price, Warrants issued	0.25		1.50
Weighted Average Exercise Price, Warrants exercised			0.24
Weighted Average Exercise Price, Warrants forfeited			0.24
Weighted Average Exercise Price, Warrants outstanding, ending balance	$ 0.40	$ 1.36	$ 1.36
custom:AverageRemainingContractualTermAbstract
Average Remaining Contractual Term, Warrants outstanding	1 year 10 months 14 days	2 years 4 months 17 days	9 months
Average Remaining Contractual Term, Warrants issued	3 years		2 years