15. ACCRUED WARRANTY (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Accrued Warranty
Accrued Warranty Costs, Beginning Balance	$ 30,000	$ 30,000
Provision for Product Warranty Expense	101,041	2,609
Settlement of Warranty Claims	(63,041)	(2,609)
Accrued Warranty Costs, Ending Balance	$ 68,000	$ 30,000

Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1),(c)(5)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

Name:	us-gaap_ExtendedProductWarrantyAccrual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant