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A reconciliation of income tax expense to the amount computed by applying the Federal income tax rate to loss before provision for income taxes as of December 31, 2021 and 2020 is as follows: (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |
Income tax credit at statutory rates | $ 495 | $ 208
Nondeductible expenses |  | 5
Tax Exempt Income - PPP Loan | (271) |
Permanent Tax Deduction Stock Options Exercised | (63) |
State income tax, net of federal benefits | 177 | 74
Expiration of NOL & Credits | 899 | 2,543
Tax basis in excess of book Convertible Debt |  |
Expiration of Stock Options | 92 | 122
Other | 2 | (7)
Change in valuation allowance | (1,294) | (2,945)
TOTAL | $ 37 |

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