10. Inccome taxes (Details - Reconciliation) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Federal income tax expense at statutory rate	$ 1,015	$ 259
State and local tax expense, net	428	180
Other permanent differences	12	14
Section 162m	296	105
Stock based compensation	157	149
Uncertain tax positions	(43)	79
Change in tax rates	(245)	8
Change in tax estimate	0	(12)
Other	(24)	0
Provision for income taxes	$ 1,596	$ 782
Federal income tax expense computed at the statutory rate, percentage	21.00%	21.00%
State and local tax expense, net, percentage	8.90%	14.50%
Other permanent differences, percentage	0.30%	1.10%
Section 162m, percentage	6.10%	8.50%
Stock based compensation, percentage	3.20%	12.10%
Uncertain tax positions, percentage	(0.90%)	6.40%
Change in tax rates, percentage	(5.00%)	0.70%
Change in tax estimate, percentage	0.00%	(1.00%)
Other, percentage	0.50%	0.00%
Provision for income taxes, percentage	33.10%	63.30%