Inccome taxes (Details - Reconciliation) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Federal income tax expense at statutory rate	$ 1,179	$ 1,015
Federal income tax expense computed at the statutory rate, percentage	21.00%	21.00%
State and local tax expense, net	$ 440	$ 428
State and local tax expense, net, percentage	7.80%	8.90%
Other permanent differences	$ 6	$ 12
Other permanent differences, percentage	0.10%	0.30%
Section 162m	$ 206	$ 296
Section 162m, percentage	3.70%	6.10%
Stock based compensation	$ 100	$ 157
Stock based compensation, percentage	1.80%	3.20%
Uncertain tax positions	$ 218	$ (43)
Uncertain tax positions, percentage	3.90%	0.90%
Change in tax rates	$ 198	$ (245)
Change in tax rates, percentage	3.40%	5.00%
Other	$ (42)	$ (24)
Other, percentage	0.70%	0.50%
Provision for income taxes	$ 2,305	$ 1,596
Provision for income taxes, percentage	41.00%	33.10%