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Inccome taxes (Details - Reconciliation) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |
Federal income tax expense at statutory rate | $ 392 | $ 1,179
Federal income tax expense computed at the statutory rate, percentage | 21.00% | 21.00%
State and local tax expense, net | $ 287 | $ 440
State and local tax expense, net, percentage | 15.40% | 7.80%
Other permanent differences | $ 8 | $ 6
Other permanent differences, percentage | 0.40% | 0.10%
Section 162m | $ 229 | $ 206
Section 162m, percentage | 12.20% | 3.70%
Stock based compensation | $ 127 | $ 100
Stock based compensation, percentage | 6.80% | 1.80%
Uncertain tax positions | $ 0 | $ 218
Uncertain tax positions, percentage | 0.00% | 3.90%
Change in tax rates | $ (83) | $ 198
Change in tax rates, percentage | 4.40% | 3.40%
Other | $ (43) | $ (42)
Other, percentage | 2.30% | 0.70%
Provision for income taxes | $ 917 | $ 2,305
Provision for income taxes, percentage | 49.10% | 41.00%

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