13. Stockholders' Equity (Details - Warrant activity) - Stock Purchase Warrants [Member] - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of warrants
Warrants outstanding, beginning balance	781,910	1,038,365	7,608,154
Warrants issued			567,166
Warrants exercised		(256,455)	(7,107,765)
Warrants forfeited			(29,190)
Warrants outstanding, ending balance	781,910	781,910	1,038,365
Weighted Average Exercise Price
Weighted Average Exercise Price, Warrants outstanding, beginning balance	$ 1.36	$ 1.36	$ 0.23
Weighted Average Exercise Price, Warrants issued			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	$ 1.36	$ 1.36	$ 1.36
custom:AverageRemainingContractualTermAbstract
Average Remaining Contractual Term, Warrants outstanding	1 year 1 month 16 days	1 year 4 months 17 days	2 years 4 months 17 days
Average Remaining Contractual Term, Warrants issued			2 years