13. INCOME TAXES (Details Narrative) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Income Tax Expense (Benefit)	$ 0	$ 0	$ 0
Other Information Pertaining to Income Taxes	During 2022, $22.0 million federal net operating losses and $171,000 general business credits expired unused.
Operating Loss Carryforwards, Limitations on Use	In certain circumstances, as specified in the Internal Revenue Code, a 50% or more ownership change by certain combinations of our shareholders during any three year period would result in limitations on our ability to use a portion of our net operating loss carryforwards.
Unrecognized Tax Benefits	$ 0	0
Income Tax Examination, Penalties and Interest Expense	$ 0	$ 0	$ 0
Open Tax Year	1998
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2022
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2041
Research Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	$ 9,600,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 440,300,000