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Schedule of Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Depreciation | $ 106,000 | $ 117,000
Allowance for bad debts | 218,000 | 202,000
Net operating loss carryforwards | 14,114,000 | 14,755,000
Stock option expense | 355,000 | 403,000
Research and other credits | 945,000 | 952,000
Other temporary differences | 15,000 | 15,000
Total gross deferred tax assets | 15,753,000 | 16,444,000
Less valuation allowance | (15,753,000) | (16,444,000)
Deferred tax assets, net |  |

X
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