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4. PATENTS, NET OF ACCUMULATED AMORTIZATION (Details Narrative) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Accumulated amortization	$ 321,784	$ 319,922
Accrued patent acquisition costs	15,000
Accrued patent acquisition costs due within a year	10,000
Accrued patent acquisition costs due within 1 year
Accrued patent acquisition costs due within 2 years	$ 5,000

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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