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Schedule of Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Depreciation | $ 109,000 | $ 106,000
Allowance for bad debts | 248,000 | 218,000
Net operating loss carry-forwards | 13,561,000 | 14,114,000
Stock option expense | 334,000 | 355,000
Research and other credits | 891,000 | 945,000
Lease liability | 99,000 | 138,000
Amortization | 130,000 |
Total gross deferred tax assets | 15,372,000 | 15,876,000
Lease liability | 69,000 | 101,000
Other temporary differences |  | 22,000
Total gross deferred tax liabilities | 69,000 | 123,000
Valuation allowance | (15,303,000) | (15,753,000)
Net deferred tax |  |

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