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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%