13. Stock Compensation (June 2019) (Details - Grant vesting periods) - Common Stock Grants [Member] - shares	6 Months Ended	12 Months Ended
Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Common stock grants outstanding	1,665,167	1,802,667	310,000
Grant 1 [Member]
Common stock grants outstanding	585,999	688,499
Vesting period	6 months	91 years
Grant 2 [Member]
Common stock grants outstanding	597,500	632,500
Vesting period	1 year	2 years
Grant 3 [Member]
Common stock grants outstanding	481,668	481,668
Vesting period	2 years	3 years

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant