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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 |  |

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